help please. its over dilutions in chemistry

Answer:

2.5 moles of sodium phosphate

Explanation:

3 Pb(NO3)2 + 2 Na3PO4 → Pb3(PO4)2 + 6 NaNO3

6 (moles in the reaction)- 7.5(moles  in the task)

2 (moles in the reaction)- x (moles in answer) ⇒6x = 2*7.5 ⇒ x = 15/6=2.5 (moles)

Answer:

c

Explanation:

Answer:

The Answer is the last one

Explanation:

Answer:

The atomic mass number does not change because a beta particle has a much smaller mass than an atom. The atomic number goes up because a neutron has turned into an extra proton, however in beta decay a fast-moving electron is fired out of the nucleolus

Hope this helped!

Answer:

D= .7

C= 1.25

B= 2.2

A= 3.6

Answer:

Who: Svante Arrhenius.

When: Claimed in 1896 that fossil fuels has a negative effect on our atmosphere.

How: Svante Arrhenius proved that fossil fuels had a negative effect by calculating the output of buildings that emit fossil fuels, and lead to the conclusion by his calculations that the industry might one day bring global warming. Svante Arrhenius' theory of electrolytic dissociation and his model of the greenhouse effect also helped him to prove that his remarks about fossil fuels and global warming is true.

Where:

I cannot find any source that mentions the where. What do you mean by where?

I hope my other information help you. I apologies to only be able to answer partially.

The one of the first scientists to realize the effects of CO₂ in the atmosphere is Svante Arrhenius.

In this question effect mat be define the possitive impact or negative impact of carbon dioxide gas in the atmosphere.

Hence, Svante Arrhenius is one of the first scientists to realize the effects of CO₂ in the atmosphere.

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S /\ Speed

mph, km/h, ft/s

Answer:

Calculating speed, distance and time

Explanation:

Answer:

0.089 moles

Explanation:

Answer:

a

Explanation:

jesus loves you!

Answer:

657/865= 75.9

D. 76%

Answer:

Na2SO4 is equal to 0.0070401642780093 mole.

Explanation:

Answer:

the answer is b

Explanation:

the answer is b

Compound of KCl has a polar bond as there is a electronegativity difference between potassium and chlorine atoms.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Answer:

The decreasing in concentration occurs after 69.0s

Explanation:

A first order reaction follows the equation:

Ln [A] = -kt + ln[A]₀

Where [A] is the concentration of the reactant after time t

k is rate constant of the reaction

And [A]₀ is the initial concentration of the reactant

Replacing:

Ln 2.45x10⁻²M = -1.80x10⁻²s⁻¹*t + ln8.48x10⁻²

-3.709 = -1.80x10⁻²s⁻¹*t -2.467

-1.2416 = -1.80x10⁻²s⁻¹*t

69.0s = t

The decreasing in concentration occurs after 69.0s

Answer:

[tex]2H_2O\rightarrow 2H_2+O_2[/tex]

Explanation:

Hello there!

In this case, for the reaction by which water is decomposed to molecular hydrogen and oxygen:

[tex]H_2O\rightarrow H_2+O_2[/tex]

It is necessary to perform the inspection balance process since there is a dissimilar number of atoms of oxygen on both sides; therefore, by putting a 2 on water we balance oxygen:

[tex]2H_2O\rightarrow H_2+O_2[/tex]

But now, there are four hydrogens on the left; therefore, we put a 2 on hydrogen to finally balance it:

[tex]2H_2O\rightarrow 2H_2+O_2[/tex]

And obviously, the coefficient in oxygen is an unwritten 1.

Best regards!

Answer:

78.96 grams

Explanation:

I looked it up and that's what I found

hope it helps

Answer:

78.96 g mol

Explanation:

78.96 g mol

in the period table the mass of Se is 78.96 g mol

Answer: 1. 140.9 g Cl

2. 63.58 g O

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}[/tex]

1. [tex]\text{Number of moles of Cl}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles[/tex]

1 mol of Cl weighs = 35.5 g

Thus 3.973 mol of Cl weighs = [tex]\frac{35.5}{1}\times 3.973=140.9g[/tex]

2. [tex]\text{Number of moles of O}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles[/tex]

1 mol of O weighs = 16 g

Thus 3.973 mol of O weighs = [tex]\frac{16}{1}\times 3.973=63.58g[/tex]

Answer:

[tex]C_7H_6O_2[/tex]

Explanation:

Hello there!

In this case, we can divide the problem in three stages: (1) determine the empirical formula with the combustion analysis, (2) compute the molar mass of acid via the moles of the acid in the neutralization and (3) determine the molecular formula.

(1) In this case, since 8.58 g of carbon dioxide are released, we can first compute the moles of carbon in the compound:

[tex]n_C=8.58gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.195molC[/tex]

And the moles of hydrogen due to the produced 1.50 grams of water:

[tex]n_H=1.50gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{2molH}{1molH_2O} =0.166molH[/tex]

Next, to compute the mass and moles of oxygen, we need to use the initial 3.4 g of the acid:

[tex]m_O=3.4g-0.195molC*\frac{12.01gC}{1molC}-0.166molH*\frac{1.01gH}{1molH} =0.89gO\\\\n_O=0.89gO*\frac{1molO}{16.0gO}=0.0556molO[/tex]

Thus, the subscripts in the empirical formula are:

[tex]C=\frac{0.195}{0.0556}=3.5 \\\\H=\frac{0.166}{0.0556}=3\\\\O=\frac{0.0556}{0.0556}=1\\\\C_7H_6O_2[/tex]

As they cannot be fractions.

(2) In this case, since the acid is monoprotic, we can compute the moles by multiplying the concentration and volume of KOH:

[tex]n_{KOH}=0.279L*0.1mol/L\\\\n_{KOH}=0.0279mol[/tex]

Which are equal to the moles of the acid:

[tex]n_{acid}=0.0279mol[/tex]

And the molar mass:

[tex]MM_{acid}=\frac{3.4g}{0.0279mol} =121.86g/mol[/tex]

(3) Finally, since the molar mass of the empirical formula is:

7*12.01 + 6*1.01 + 2*16.00 = 122.13 g/mol

Thus, since the ratio of molar masses is 122.86/122.13 = 1, we infer that the empirical formula equals the molecular one:

[tex]C_7H_6O_2[/tex]

Best regards!

Answer:

Explanation:

the addition of an indicator to the analyte solution helps us to visually spot the equivalence point in an acid-base titration. Endpoint: refers to the point at which the indicator changes color in an acid-base titration.

Answer:

sandstone

Explanation:

Sandstone is a mineral rock made of small particles.

Answer:

Displacement.

Explanation:

The example i.e. these foreigners before arriving in our Town traveled several miles from west to southeast represents displacement not distance because in this example direction of the objects are given. We know that distance is a scalar quantity which is expressed from its magnitude only while on the other hand, displacement is a vector quantity which can be fully explained through magnitude as well as direction of the object. in this example, west to southeast represents direction of the objects so we can say that it refers to the displacement.

Answer:

107.8682 grams.

Explanation:

Answer:

The temperature is 12.35 C.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

In this case:

Replacing:

2.15 atm* 35.28 L= 3.24 moles* 0.082[tex]\frac{atm*L}{mol*K}[/tex] * T

Solving:

[tex]T=\frac{2.15 atm* 35.28 L}{3.24 moles* 0.082\frac{atm*L}{mol*K}}[/tex]

T=285.5 K= 12.35 C (being 273.15 K= 0 C)

The temperature is 12.35 C.

The relation between the moles, volume, temperature, and pressure is given by the ideal gas equation. The temperature of a gas is 12.35 celsius.

The ideal gas law is the hypothetical gas law that depicts the relation between pressure, volume, moles of the compound, and the temperature of the gas.

The ideal gas equation is given as,

[tex]\rm PV = nRT[/tex]

Given,

Pressure (P) = 2.15 atm

Volume (V) = 35.28 L

Number of moles (n) = 3.24 mol

Gas constant (R) = 0.082

Temperature (T) = ?

Substituting values in the above equation, the temperature is calculated as:

[tex]\begin{aligned} \rm T &= \rm \dfrac{PV}{nR}\\\\&= \dfrac{2.15\times 35.28}{3.24 \times 0.082}\\\\&= 286.23 \;\rm K\end{aligned}[/tex]

Therefore, 12.35 degrees Celsius is the temperature of the gas.

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Explanation:

Competition stems from the fact that resources are limited. There are simply not enough of some resources for all individuals to have equal access and supply. Competition can occur between organisms of the same species, or between members of different species.

Answer:

It's D. Francium

Explanation:

Atomic radii vary in a predictable way across the periodic table. The atomic radius increases from top to bottom in a group and decreases from left to right across a period. Thus, Helium is the smallest element, and Francium is the largest.

Answer:

Free Energy (G) can either increase or decrease for a reaction when the temperature increases. It depends on the entropy (S) change. The change in a quantity is represented by the Greek letter delta. ... Hence, when the temperature increases the numeric value of the free energy becomes larger.

Explanation:

The change in Gibbs free energy (ΔG) of a chemical reaction depends on the initial and final states of the reactants and products, as well as on the temperature and pressure conditions of the reaction.

The Gibbs free energy of a reaction tells us whether a reaction is spontaneous or not under given conditions, with negative ΔG values indicating a spontaneous reaction and positive ΔG values indicating a non-spontaneous reaction.

The temperature of the reactants and products is important in determining the Gibbs free energy change because the Gibbs free energy change is related to the enthalpy change (ΔH) and the entropy change (ΔS) of the reaction through the equation:

ΔG = ΔH - TΔS

where T is the temperature in Kelvin.

Thus, the temperature of the reactants and products must be known in order to calculate the Gibbs free energy change of a reaction accurately.

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Answer:

C. 1.6 atm

Explanation:

PV = nRT

Solve for P --> P = nRT/V

n = 3.0 mol

R = 0.08206 L atm / mol K

T = 400.0 K

V = 60.0 L

P = (3.0)(0.08206)(400.0) / (60.0) = 1.6 atm

Answer:

8.07×10²³ units

Explanation:

6.02×10²³×1.34

8.07×10²³ units

Answer:

The answer is B & C

Explanation: