Answer:
7.97 moles of neon are present in the canister.
Explanation:
Avogadro's constant or "Avogadro's number" is the number of constituent particles found in the amount of substance in one mole.
In other words, Avogadro's number is the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.
So, you can apply the following rule of three: if 6.023*10²³ atoms are present in 1 mole, 4.8*10²⁴ atoms are present in how many moles?
[tex]amount of moles=\frac{4.8*10^{24}atoms*1 mole }{6.023*10^{23}atoms}[/tex]
amount of moles= 7.97 moles
7.97 moles of neon are present in the canister.
if 5.00 mol of hydrogen gas and 1.20 mol of oxygen gas react, what is the limiting reactant?
a. H2
b. O2
c. neither H2 or O2
how many moles of water are produced according to the equation?
Express your answer with the appropriate units.
nH2O=___
If 5.00 mol of hydrogen gas and 1.20 mol of oxygen gas react, the limiting agent is O₂.
The number of moles of water produced according to the equation is 1.20 mol.
To determine the limiting reactant, we need to compare the moles of hydrogen gas (H₂) and oxygen gas (O₂) and determine which reactant is present in a lower stoichiometric ratio.
From the information, we have:
Moles of H₂ = 5.00 mol
Moles of O₂ = 1.20 mol
The balanced equation for the reaction between hydrogen gas and oxygen gas to form water (H₂O) is:
2H₂(g) + O₂(g) -> 2H₂O(g)
According to the stoichiometry of the balanced equation, the ratio of H₂ to O₂ is 2:1. This means that for every 2 moles of H₂, we need 1 mole of O₂ to completely react.
Calculating the stoichiometric ratio for the given amounts:
Moles of H₂ / Coefficient of H₂ = 5.00 mol / 2 = 2.50 mol
Moles of O₂ / Coefficient of O₂ = 1.20 mol / 1 = 1.20 mol
Comparing the calculated stoichiometric ratios, we see that the mole ratio of H₂ (2.50 mol) is greater than the mole ratio of O₂ (1.20 mol). This means that the H₂ is in excess, and O₂ is the limiting reactant.
Therefore, the limiting reactant is O₂.
To determine the number of moles of water (H₂O) produced according to the balanced equation, we can use the stoichiometry:
For every 2 moles of H₂O, we need 1 mole of O₂. Since O₂ is the limiting reactant, the number of moles of H₂O produced is equal to the moles of O₂:
nH₂O = 1.20 mol
Therefore, the number of moles of water produced according to the equation is 1.20 mol.
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A buildup of charges in an object is called
Answer:
Static Electricity
Explanation:
Answer:
static electricity
Explanation:
at which point will the ph of a buffered solution begin to change significantly?
The pH of a buffered solution will begin to change significantly when the concentration of added strong acid or base is greater than the capacity of the buffer.
This capacity is determined by the buffer's concentration and the dissociation constant of its acid-base pair.
When a buffered solution is subjected to small amounts of strong acid or base, it should retain its pH value because the buffer will react with the added ions to produce an excess of weak acid or base ions, keeping the pH constant.
As the concentration of strong acid or base added to the solution increases, however, the capacity of the buffer is eventually exceeded, and the pH of the solution will change significantly.
The capacity of a buffer depends on its concentration and on the acid dissociation constant (Ka) of the weak acid component and the base dissociation constant (Kb) of the weak base component.
This can be calculated using the Henderson-Hasselbalch equation:pH = pKa + log ([A-]/[HA])where pH is the pH of the buffer solution, pKa is the dissociation constant of the weak acid component, [A-] is the concentration of the weak base component, and [HA] is the concentration of the weak acid component.
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.What is the pH of a 0.023 M HCl solution?
where do elements in the human body tend to be located on the periodic table
The elements in the human body tend to be located in different regions of the periodic table. This is because the human body is made up of a wide range of elements, each with its own properties, uses, and functions. Overall, the elements in the human body tend to be located in different regions of the periodic table depending on their properties and functions.
Most of these elements are found in the first four rows of the periodic table, which are also known as the main group elements. These elements include hydrogen, carbon, nitrogen, oxygen, phosphorus, and sulfur, which are all essential for life. They are located in different regions of the periodic table, with hydrogen in the first row, carbon and nitrogen in the second row, oxygen in the third row, and phosphorus and sulfur in the fourth row. Other important elements in the human body include sodium, potassium, calcium, magnesium, iron, and zinc, which are located in the lower regions of the periodic table. Overall, the elements in the human body tend to be located in different regions of the periodic table depending on their properties and functions.
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Which reaction produces an increase in the entropy of the system?
H 2 (g) + Cl 2 (g) → 2 HCl (g)
H 2O (l) → H 2O (s)
N 2 (g) + 3 H 2 (g) → 2 NH 3 (g)
Ag + (aq) + Cl - (aq) → AgCl (s)
CO 2 (s) → CO 2 (g)
CO 2 (s) → CO 2 (g) produces an increase in the entropy of the system
Define entropy.
Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive work. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organised molecular motion.
Because a higher temperature increases the kinetic energy of molecules and, as a result, unpredictability, the entropy of the system rises with temperature. When a reaction generates more molecules than it started with, entropy typically rises. When a reaction creates fewer molecules than it began with, entropy typically decreases.
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Use the DIvergence theorem to compute the flux of the vector field F(x,y,z) = x3 i + y3 j + z3 K
over the surface\sigmawhich is the surface of the sphere x2 + y2 + z2 = 9
(hint: after setting up the triple integral, use spherical coordinates to compute it)
To compute the flux of [tex]F(x, y, z) = x^3 i + y^3 j + z^3 k[/tex] over the surface Σ of the sphere [tex]x^2 + y^2 + z^2 = 9[/tex] using the Divergence Theorem, set up and evaluate the triple integral in spherical coordinates:Flux = ∫₀²π ∫₀ᴨ ∫₀³ ([tex]3p^4[/tex] sin(φ)) dρ dθ dφ
To compute the flux of the vector field [tex]F(x, y, z) = x^3 i + y^3 j + z^3 k[/tex] over the surface Σ, which is the surface of the sphere [tex]x^2 + y^2 + z^2 = 9[/tex], we can apply the Divergence Theorem.
The Divergence Theorem states that the flux of a vector field across a closed surface is equal to the triple integral of the divergence of the vector field over the volume enclosed by the surface.
First, let's calculate the divergence of F:
div(F) = (∂/∂x)([tex]x^3[/tex]) + (∂/∂y)(y^3) + (∂/∂z)([tex]z^3[/tex])
= [tex]3x^2 + 3y^2 + 3z^2[/tex]
Now, we need to set up the triple integral using spherical coordinates.
In spherical coordinates, the volume element is given by [tex]dV = P^2[/tex] sin(φ) dρ dθ dφ, where ρ is the radial distance, θ is the azimuthal angle, and φ is the polar angle.
The surface Σ represents the boundary of the volume enclosed by the sphere. In spherical coordinates, the equation of the sphere [tex]x^2 + y^2 + z^2 = 9[/tex]becomes [tex]p^2 = 9[/tex].
The unit outward normal vector on the surface of the sphere can be expressed as n = (ρ/3)p, where p is the unit vector in the radial direction.
Using the Divergence Theorem, the flux (F · n) over the surface Σ is equal to the triple integral of the divergence of F over the volume enclosed by Σ:
Flux = ∭V (div(F)) dV
= ∭V ([tex]3p^2[/tex]) dV
= ∫₀²π ∫₀ᴨ ∫₀³ (3[tex]p^2[/tex]) [tex]p^2[/tex] sin(φ) dρ dθ dφ
Here, the limits of integration are as follows:
ρ: 0 to 3
θ: 0 to 2π
φ: 0 to π
Now, we can calculate the flux by evaluating the triple integral:
Flux = ∫₀²π ∫₀ᴨ ∫₀³ ([tex]3p^4[/tex] sin(φ)) dρ dθ dφ
Evaluating this triple integral will give us the flux of the vector field F over the surface Σ.
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Use standard free energies of formation to calculate ΔG∘ at 25 ∘C for the following reaction and predict if the reaction will be spontaneous
at this temperature under the standard conditions.
3H2(g)+Fe2O3(s)→2 Fe(s)+3H2O(g)
At 25 ∘C, the calculated value of ΔG∘ for the reaction 3H2(g) + Fe2O3(s) -> 2Fe(s) + 3H2O(g) is 138.4 kJ/mol. Since ΔG∘ is positive, the reaction is non-spontaneous under standard conditions at this temperature. A positive ΔG∘ indicates that the reaction requires energy input to occur.
To calculate ΔG∘ at 25 ∘C for the reaction 3H2(g) + Fe2O3(s) -> 2Fe(s) + 3H2O(g) using standard free energies of formation, we need to subtract the sum of the standard free energies of formation of the reactants from the sum of the standard free energies of formation of the products.
The standard free energies of formation for the given compounds at 25 ∘C can be looked up in reference tables. The values are as follows:
ΔG∘f(H2(g)) = 0 kJ/mol
ΔG∘f(Fe2O3(s)) = -824.2 kJ/mol
ΔG∘f(Fe(s)) = 0 kJ/mol
ΔG∘f(H2O(g)) = -228.6 kJ/mol
Using these values, we can calculate ΔG∘ for the reaction:
ΔG∘ = (2 * ΔG∘f(Fe(s)) + 3 * ΔG∘f(H2O(g))) - (3 * ΔG∘f(H2(g)) + ΔG∘f(Fe2O3(s)))
ΔG∘ = (2 * 0 kJ/mol + 3 * (-228.6 kJ/mol)) - (3 * 0 kJ/mol + (-824.2 kJ/mol))
ΔG∘ = -685.8 kJ/mol + 824.2 kJ/mol
ΔG∘ = 138.4 kJ/mol
At 25 ∘C, the calculated value of ΔG∘ for the reaction 3H2(g) + Fe2O3(s) -> 2Fe(s) + 3H2O(g) is 138.4 kJ/mol. Since ΔG∘ is positive, the reaction is non-spontaneous under standard conditions at this temperature. A positive ΔG∘ indicates that the reaction requires energy input to occur.
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Do bananas have seeds?
Answer:
no they dont
Explanation:
If the pressure in the gas tank of the dipper was set very high, the ideal Gas law breaks
down.
Why is this happening?
a) Argon reacts with the walls of the steel vessel at high pressure
b) The molecules would clump together in the center and invalidate the law
c) A steady measurement could not be made as the gas would leak out too quickly
d) The volume occupied by the molecules themselves is no longer negligible
Answer: d) The volume occupied by the molecules themselves is no longer negligible. This most be the answer because a, b and c don't make any sense at all.
Explanation:
The volume occupied by the molecules themselves is no longer negligible. Hence, option D is correct.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
The ideal gas law fails at low temperature and high pressure because the volume occupied by the gas is quite small, so the inter-molecular distance between the molecules decreases.
Hence, the volume occupied by the molecules themselves is no longer negligible.
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Which of Graphs 1 correctly represents the relationship between the pressure and Kelvin temperature of a gas?
Answer:
B
Explanation:
Pressure is directly proportional to temperature
The graph correctly showing the pressure - temperature relationship is figure B. Temperature and pressure is in direct proportionality.
What is Gay- Lussacs law?According to Gay-Lussacs law, at constant volume of gases, the pressure of a gas is directly proportional to the temperature. Thus we can write it as:
P/T = a constant.
Gay-Lussacs law is supportive of kinetic molecular theory. As per kinetic theory of gases, as the temperature increases, kinetic energy of particles increases results in forceful collisions of energetic particles to the wall of container and in between them.
Therefore, the temperature - pressure graph will show a linear relationship. The figure B represents a linear curve and hence it shows the correct relation.
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The Henry's Law constant of methyl bromide, CH3Br, is k = 0.159 mol/(L atm) at 25C. What is the solubility of methyl bromide in water at 25C and at a partial pressure of 300. mm Hg? Choose one answer. a. 0.0628 mol/L b. 0.395 mol/L c. 0.403 mol/L d. 47.7 mol/L
The solubility of methyl bromide in water at 25°C and a partial pressure of 300 mm Hg can be calculated using Henry's Law. The Henry's Law constant for methyl bromide is given as 0.159 mol/(L atm) at 25°C. By applying the equation for Henry's Law, the solubility of methyl bromide in water can be determined.
Henry's Law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. The equation for Henry's Law is written as:
S = k * P
Where S is the solubility of the gas in the liquid, k is the Henry's Law constant, and P is the partial pressure of the gas. In this case, we are given the Henry's Law constant for methyl bromide as 0.159 mol/(L atm) at 25°C. The partial pressure of methyl bromide is given as 300 mm Hg.
Substituting the values into the equation, we have:
S = 0.159 mol/(L atm) * (300 mm Hg)
To convert mm Hg to atm, we divide by the conversion factor of 760 mm Hg/atm:
S = 0.159 mol/(L atm) * (300 mm Hg / 760 mm Hg/atm)
Simplifying the equation, we find:
S ≈ 0.0628 mol/L
Therefore, the solubility of methyl bromide in water at 25°C and a partial pressure of 300 mm Hg is approximately 0.0628 mol/L.To learn more about Henry's Law click here: brainly.com/question/30636760
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Which of the isomeric alcohols having the molecular formula C6H14OC6H14O are chiral? Which are achiral?
1-hexanol, 2-hexanol, and 3-hexanol are chiral because they possess a chiral center. 2-methylpentanol is achiral because it lacks a chiral center.
To determine which isomeric alcohols with the molecular formula C₆H₁₄O are chiral and which are achiral, we need to examine their structural features, specifically the presence or absence of a chiral center.
A chiral center is a carbon atom bonded to four different substituents, resulting in non-superimposable mirror images. If a molecule has a chiral center, it is chiral; otherwise, it is achiral.
Let's examine the structural isomers of C₆H₁₄O
1-Hexanol (CH₃(CH₂)₄OH)
This molecule contains a chiral center at the carbon atom bonded to the hydroxyl group (OH). Since it has four different substituents (CH₃, CH₂, CH₂, and H), 1-hexanol is chiral.
2-Hexanol (CH₃CH₂CH(OH)CH₂CH₃)
This molecule also contains a chiral center at the carbon atom bonded to the hydroxyl group (OH). It has four different substituents (CH₃, CH₂, CH₂, and CH₃), making 2-hexanol chiral.
3-Hexanol (CH₃CH₂CH₂(OH)CH₂CH₃)
Similarly, this molecule contains a chiral center at the carbon atom bonded to the hydroxyl group (OH). It has four different substituents (CH₃, CH₂, CH₂, and CH₃), making 3-hexanol chiral.
2-Methylpentanol (CH₃CH(CH₃)CH₂CH₂OH)
In this molecule, there is no chiral center present since the carbon atom bonded to the hydroxyl group (OH) is also bonded to two identical methyl groups (CH₃). Therefore, 2-methylpentanol is achiral.
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HELP MEEEEEEE PLSSS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 As distance increases between a rocket ship and the ground, gravitational force remains the same decreases increases pushes less
Answer:
decreases
Explanation:
Gravirational force is directly proportional to the mass and inversely proportional to the distance.(Newton's law of gravitation)
Jess is baking a cake. Part of the recipe has Jess mix butter and water. He notices that the two substances don't mix. He is confused because water and butter are both covalent compounds. Explain why the butter and water are NOT mixing in the bowl.
Answer:
butter and water don't mix because water is polar and butter is nonpolar
Explanation:
for them to be able to mix they would need to be both polar or both nonpolar.
SO2 +
Li2Se →
SSe2 +
Li20
Type of Reaction:
We want to take inventory of the right and left side
Right: S=1 O = 2 Li = 2 Se= 1
Left: S= 1 Se=2 Li= 2 O=1
Lets balance out each side because we see we are off by 1 oxygen on the left
Add a coefficient of 2 on the Li2O
Add a coefficient of 2 on the right Li2Se
Now we have So2+ 2Li2Se ---> SSe2+ 2Li2O
or
The equation is already balanced, assuming that there is supposed to be a yields symbol between 2Li2Se and SSe2.
To find out whether or not this equation is balanced, make a little T-chart with the left side of the equation on one side and the left on the other. Next to each element, write down the amount they start off with and make changes as you add coefficients.
Hope this helps!
____ N2 + ___ H2 --> ____ NH3
Reaction :
N2 +H2 →2 NH3
"Reactants Products Nitrogen 2 2 Hydrogen 2 6 Since NH3 is multiplied by a coefficient of 2 there are now 2 nitrogens and 6 hydrogens. The 6 hydrogens come from the 2 multiplied by the subscript of 3."
If the number of bacteria in a colony doubles every 18 minutes and there is currently a population of 200,000 bacteria, what will the population be 36 minutes from now?
Answer:
After 36 minutes, there will be a population of 800,000 bacteria.
Explanation:
After the first 18 minutes, it will double to 400,000. Then, at 36 minutes, it will have doubled again, giving you 800,000.
The Kinetic Molecular Theory describes the behavior as well as the characteristics of an ideal gas. What are the five postulates of this theory? Provide at least 3 examples to describe these postulates.
Answer:
See explanation
Explanation:
The postulates of the kinetic theory of matter are;
Every substance is made up of tiny particles called molecules. Brownian motion and diffusion illustrates this fact.The molecules that compose matter are in constant random motion.There exists an attractive force between the molecules in matter. The attractive forces between gases are negligible. Solids have a definite shape and volume due to a high magnitude of intermolecular forces. Liquids have a volume but no definite shape due to weaker intermolecular forces. Gases have the weakest intermolecular forces hence the do not have both a shape and volume. They take on the volume of the container into which they are put. This illustrates this fact.The actual volume occupied by gas molecules is negligible relative to the volume of the container. The fact that gases are easily compressible illustrates this fact.Temperature is a measure of the average kinetic energy of the molecules of a body.Which one of the following decreases as the strength of the attractive intermolecular forces increases? A) The heat of vaporization B) The boiling point of a liquid C) The vapor pressure of a liquid D) The viscosity of a liquid
The heat of vaporization decreases as the strength of the attractive intermolecular forces increases.
The heat of vaporization is the amount of energy required to convert a substance from its liquid phase to its gaseous phase at a constant temperature. As the strength of the attractive intermolecular forces increases, it becomes more difficult for the molecules to overcome these forces and transition into the gas phase.
This means that a greater amount of energy (heat) is required to break the intermolecular forces and vaporize the substance. Therefore, the heat of vaporization increases as the strength of the attractive intermolecular forces increases.
On the other hand, the boiling point of a liquid (B), the vapor pressure of a liquid (C), and the viscosity of a liquid (D) all tend to increase as the strength of the attractive intermolecular forces increases. Higher intermolecular forces result in higher boiling points, lower vapor pressures, and higher viscosity due to the stronger interactions between molecules.
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show that the rydberg equation and the bohr equation are virtually the same.
In short, the Rydberg equation and the Bohr equation are two different forms of the same fundamental relationship, describing the behavior of energy levels and wavelengths in hydrogen or hydrogen-like systems.
What is Rydberg Equation ?
The Rydberg equation is an empirical relationship equation expressed by Balmer and Rydberg.
The Rydberg equation and the Bohr equation are closely related and can be considered different forms of the same mathematical expression. Let's explore them and compare their similarities.
Rydberg equation:
The Rydberg equation is an empirical formula that describes the wavelengths of spectral lines emitted or absorbed by hydrogen or hydrogen species. Is given:
1/λ = R* (1/n₁2 - 1/n₂2)
where λ is the wavelength of emitted or absorbed light, R is the Rydberg constant, and n1 and n₂ are integers representing the principal quantum numbers of the respective energy levels.
Bohr equation:
Bohr's equation, derived from Bohr's model of the hydrogen atom, relates the energy levels of an electron in a hydrogen-like atom to its principal quantum number. Is given:
E = -13.6 eV/n2
where E is the energy of the electron, -13.6 eV is the ionization energy of hydrogen, and n is the principal quantum number.
Now let's compare the two equations:
1/λ = R * (1/n₁2 - 1/n₂2) (Rydberg equation)
E = -13.6 eV/n² (Bohr equation)
We can observe that the Bohr equation gives the energy of the electron in terms of the principal quantum number, while the Rydberg equation gives the wavelength of light emitted or absorbed in terms of the principal quantum numbers.
We can use the relationship between energy and wavelength to make the connection between these two equations:
E = h*c/A
where h is Planck's constant and c is the speed of light.
Combining this relation with the Bohr equation, we have:
-13.6 eV / n² = h * c / λ
Rearranging the equation:
1/λ = (-13.6 eV / n²) / (h * c)
By comparing this equation with the Rydberg equation, we can see that the term (-13.6 eV / n²) / (h * c) is equivalent to the Rydberg constant R. Therefore, we can rewrite the equation as:
1/λ = R* (1/n₁2 - 1/n₂2)
This shows that the Rydberg equation and the Bohr equation are practically the same, just expressed in slightly different forms. The Rydberg constant R in the Rydberg equation includes the constant terms such as the ionization energy, Planck's constant, and the speed of light present in the Bohr equation.
In short, the Rydberg equation and the Bohr equation are two different forms of the same fundamental relationship, describing the behavior of energy levels and wavelengths in hydrogen or hydrogen-like systems.
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My teacher didn’t explain this. Please Help Me!!
Due to their low melting points nitrogen oxygen and helium are examples of which type of matter when at room
temperatures?
A. Gas
B.liquid
C.Plasma
D. Solid
molecular iodine, i2(g), dissociates into iodine atoms at 625 kwith a first-order rate constant of 0.271 s-1. (a) what is thehalf-life for this reaction? (b) if you start with 0.050 m i2 atthis temperature, how much will remain after 5.12 s assumingthat the iodine atoms do not recombine to form i2?
The half-life for this reaction is approximately 2.56 seconds.
Approximately 0.014 M of I₂ will remain after 5.12 s, assuming no recombination of iodine atoms to form I₂.
(a) The half-life of a first-order reaction can be calculated using the equation:
t₁/₂ = (0.693) / k
Given that the rate constant (k) is 0.271 s⁻¹, we can substitute this value into the equation:
t₁/₂ = (0.693) / 0.271 = 2.56 s
(b) To determine the remaining amount of I₂ after 5.12 s, we can use the first-order integrated rate equation:
[tex][A] = [A_{0} ]* e^{(-kt)}[/tex]
Where [A] is the concentration at time t, [A₀] is the initial concentration, k is the rate constant, and e is the base of natural logarithm.
Given [A₀] = 0.050 M, k = 0.271 s⁻¹, and t = 5.12 s, we can calculate:
[A] = 0.050 * e^(-0.271 * 5.12)
[A] = 0.050 * e^(-1.387)
[A] = 0.014 M
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How many atoms are in 365 grams of CaCl2
Answer: 110
Explanation:
a sample of br2(g) takes 24.0 min to effuse through a membrane. how long would it take the same number of moles of ar(g) to effuse through the same membrane?
It would take the same number of moles of Ar(g) approximately 6.0 min to effuse through the same membrane.
The Graham's law of effusion states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass (i.e., the larger the molar mass of a gas, the slower it will effuse). Therefore, we can use this law to find the answer to the given problem. Here are the steps to solve the problem:
Step 1: Calculate the molar mass of Br2(g) and Ar(g)
The molar mass of Br2(g) is:1 × 2 + 79.904 × 2 = 159.808 g/mol
The molar mass of Ar(g) is:39.95 g/mol
Step 2: Calculate the ratio of the square roots of the molar masses
Ratio of the square roots of molar masses = sqrt(molar mass of Ar(g)) / sqrt(molar mass of Br2(g))= sqrt(39.95) / sqrt(159.808)= 0.25
Step 3: Calculate the time required for Ar(g) to effuse through the membrane
We can use the ratio of the square roots of molar masses to find the time required for Ar(g) to effuse through the same membrane.
Time for Ar(g) to effuse = (ratio of the square roots of molar masses) × (time for Br2(g) to effuse) = 0.25 × 24.0 min = 6.0 min
Therefore, it would take the same number of moles of Ar(g) approximately 6.0 min to effuse through the same membrane.
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What is the pH at the half-equivalence point in the titration of a weak base with a strong acid? The pKb of the weak base is 7.95.
a. 7.95
b. 8.75
c. 6.05
d. 5.25
Titration is the process of determining the amount of a substance in a solution by measuring the volume of a solution with a known concentration that is required to react with it. The answer to the given question is option d) 5.25.
In the titration of a weak base with a strong acid, the pH at the half-equivalence point can be calculated as follows: At the half-equivalence point, we have equal moles of the weak base and the strong acid. As a result, we get a solution that contains the weak base, its conjugate acid, and water. In the solution, there is an equilibrium between the weak base and its conjugate acid. This equilibrium has an acid dissociation constant, Ka. It's given by:
Ka = [H+][A–]/[HA]
The pKa is calculated by taking the negative logarithm of Ka:
pKa = -log(Ka)
At the half-equivalence point, [HA] = [A–] and the expression for pKa becomes:
pKa = -log([H+])
Therefore, the pH at the half-equivalence point is:
pH = 1/2 (pKb + pKa)
Given that pKb = 7.95 for the weak base, we can calculate the pKa:
pKw = 14 (at 25°C)
pKw = pKa + pKb
14 = pKa + 7.95
pKa = 6.05
Therefore, the pH at the half-equivalence point is:
pH = 1/2 (7.95 + 6.05)
pH = 1/2 (14)
pH = 7
At the half-equivalence point, the pH of the solution is equal to 7. Therefore, option d) 5.25 is incorrect.
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Iron is denser than helium.
True or false
Explanation:
Elements heavier than Helium are synthesized in a number of environments. For elements that are lighter than Iron, those elements are synthesized during various phases in the evolution of massive stars. For elements heavier than Iron, one needs quite a bit of energy input to form these heavy elements.
1. Complete the balanced dissociation equation for the compound below. If the compound does not dissociate, write NR after the reaction arrow.
(NH4)2S(s) -> ______
2. Write the balanced NET ionic equation for the reaction when Al(NO₃)₃ and Na₃PO₄ are mixed in aqueous solution. If no reaction occurs, write only NR.
Answer:
1. (NH₄)₂S(s) -----> NH₄+(aq) + S²-(aq)
2. Al³+ (aq) + PO₄³+ (aq) ----> AlPO₄ (s)
Explanation:
The dissociation of ammonium sulphide, (NH₄)₂S when dissolved in water is given in the equation below:
(NH₄)₂S(s) -----> NH₄+(aq) + S²-(aq)
However very little S²- ions are present in solution due to the very basic nature of the S²- ion (Kb = 1 x 105).
The ammonium ion being a better proton donor than water, donates a proton to sulphide ion to form hydrosulphide ion which exists in equilibrium with aqueous ammonia.
S²- (aq) + NH₄+ (aq) ⇌ SH- (aq) + NH₃ (aq)
Aqueous solutions of ammonium sulfide are smelly due to the release of hydrogen sulfide and ammonia, hence, their use in making stink bombs.
2. The reaction between aluminium nitrate and sodium phosphatein aqueous solution is a double decomposition reaction whish results in the precipitation of insoluble aluminium phosphate. The equation of the reaction is given below :
Al(NO₃)₃ (aq) + Na₃PO₄ (aq) ----> AlPO₄ (s) + 3 NaNO₃ (aq)
The net ionic equation is given below:
Al³+ (aq) + PO₄³+ (aq) ----> AlPO₄ (s)
Calculate the mass of iron which will be converted into its
oxide (Fe3O4) by the action of 20 grams of steam on it.
3Fe + 4H2O + Fe3O4 + 4H2
Answer: 46.66 Grams
Explanation:
Credits to jasminealexismacias, Enjoy your CK12
relationship between temperature and flux in a carrier ionophore
The relationship between temperature and flux in a carrier ionophore is generally described by the Arrhenius equation, which relates the rate of a chemical reaction to temperature.
Relationship between temperature and flux in a carrier ionophoreIn the context of ionophores, which are molecules that facilitate the transport of ions across cell membranes, the flux refers to the rate or magnitude of ion transport.
According to the Arrhenius equation, the rate of a reaction or flux is exponentially dependent on temperature. The equation is typically represented as:
k = A * exp(-Ea / (RT))
In this equation, k represents the rate constant or flux, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.
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