How many grams of Br are in 395 g CaBr2 ?

Acetyl group, oxaloacetic acid, coA, citric acid, and other elements are the substates and products required to initiate and finish the TCA cycle.

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Carbon, hydrogen, and oxygen are the main components. Glucose has the chemical formula C6H12O6. This indicates that there are six carbon atoms in each glucose molecule.

What is the name of a 6 carbon ring?

Image for number 18 What is the chemical formula of a molecule with 6 carbons, 12 hydrogens, and 1 oxygen? CsH6O12 120g as Josqmos as ed of slunnal; C6H12OH; and C6H11OH, 8C12HO, C7H12O3, and

Aromatic rings are hydrocarbons that contain benzene or another comparable ring structure. They are sometimes referred to as aromatic compounds or arenes. The chemical symbol for benzene, C6H6, is frequently represented as a ring of six carbon atoms with alternate double and single bonds: There are a few issues with this straightforward image, though.

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Answer

B.

Explanation

The diagram shown below correctly shades the S, P, D, F-block of the periodic table:

Comparing the above with the given options, the diagram which correctly shades the f-block of the periodic table in blue will be option B:

According to the stoichiometry, 0.4 ml of hydrogen gas  is produced from 0.2 moles of calcium .

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given problem, 1 mole of calcium produces 1 mole of hydrogen gas.

Given 0.2 moles of calcium , so mass  of calcium  by number of moles formula,mass=number of moles×molar mass=0.2×40.07=8.014 g

As 40.07 g of calcium produces 2 g hydrogen

∴8.014 g calcium produces 8.014×2/40.07=0.4 ml.

Thus, the volume of hydrogen gas produced from 0.2 moles of calcium at standard temperature and pressure is 0.4 ml.

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Oxygen have 6 valence electrons. It needs only two electrons to get a full outer shell.

Thus, oxygen will gain two electrons.

v/v Concentration is a type of concentration in which we use to determine what would be the percentage of a certain volume of solute (the one with the least volume) by a certain volume of solution (the one with the most volume). The formula for this will be:

%v/v = volume of solute/volume of solution

In this question, we have:

%v/v = 8.7%, which is 0.087

volume of solute = 34.2 mL

Now we add these values into the formula:

0.087 = 34.2/v

v * 0.087 = 34.2

v = 34.2/0.087

v = 393 mL of ethanol solution that contains 34.2 mL of ethanol

The heat of formation of the chlorine tri fluorde is  -1513 kJ.

The enthalpy refers to the heat that is absorbed or emitted in a reaction. We know that if the heat is absorbed the enthalpy of the reaction is positive but if heat is evolved, the enthalpy of the reaction is negative.

Now we can find the heat of the formation of chlorine tri fluoride a follows;

We have to use the formula;

Sum of enthalpy of formation of products - Sum of enthalpy of formation of reactants

-1196 =(0 + 271 + 0) - (x + (- 46))

-1196 = 271 - x + 46

-1196 = 317 - x

x = -1196  - 317

x = -1513 kJ

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Missing parts;

Consider the reaction 2ClF3 (g) + 2NH3 (g) → 6HF (g) + N2 (g) + Cl2 (g) △H-_1196 kJ Given the following enthalpies of formation, calculate AHf for CIF3 (9) NH3 (g)- 46 kJ/mol HF 9)271 kJ/mol kJ

The molarity of carbonic acid is 0.063M when titration is done between 47.00mL carbonic acid and 23.82mL of 0.1250M ammonium hydroxide.

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known. To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen

Mathematically

moles or carbonic acid =moles of ammonium hydroxide

[tex]M_{1} V_{1} =M_{2} V_{2} \\M_{1} =Molarity of carbonic acid\\V_{1} =Volume of carbonic acid\\M_{2} =Molarity of ammonium hydroxide\\V_{2} =Volume of ammonium hydroxide[/tex]

Substituting all values

[tex]M_{1}[/tex]=(0.1250×23.82)÷47.00

[tex]M_{1}[/tex]=0.063M

Thus the molarity of carbonic acid is 0.063M

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The correct way of presenting the given molecule is CH₄, with the number subscripted.

The subscripted numbers indicates how many of the previous element are in the molecule.

If there are no subscripted number after a given element, it means it is a implicit 1.

So, in CH₄, there is no number after C, so it is implicit it is a 1, and after the H there are a 4. This means that we have 1 C atom and 4 H atoms.

C is carbon and H is hydrogen, so:

A molecule of CH₄ consists of 1 carbon atom and 4 hydrogen atoms.

Color is a physical property of matter related to a material’s ability to reflect light.

Color is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical.

Color is that portion of the visible spectrum of light that is reflected back from a surface. A color can only be observed in the presence of light.

When light hits a surface, the particles of the object absorbs the colors in the light. However, not all colours are absorbed by the surface as some are reflected. The reflected color is seen as the color of that object.

The color of light coming from an object is what gives it color. Light travels into the eye to the retina located on the back of the eye. The human eye and brain work together to translate light into color.

Therefore, it can be said that a substance's ability to reflect light is color.

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Taking into account the reaction stoichiometry, 1.25 moles of NO are formed from 3.75 moles of NO₂ if there is plenty of water present.

In first place, the balanced reaction is:

3 NO₂ + H₂O  → 2 HNO₃ + NO

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Amount of moles of NO formed

The following rule of three can be applied: if by reaction stoichiometry 3 moles of NO₂ form 1 mole of NO, 3.75 moles of NO₂ form how many moles of NO?

amount of moles of NO= (3.75 moles of NO₂× 1 mole of NO)÷ 3 moles of NO₂

amount of moles of NO= 1.25 moles

Finally, 1.25 moles of NO are formed.

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The amount of gold that can be produced from 213.46g AuPO₄ is equal to 143.7g.

A mole is a standard unit that can be used to determine the huge number of quantities of ions,  atoms, molecules, or other particular particles. The mass of the 1 mole of any element is known as atomic mass (in grams) and the mass of one mole of any compound is called molar mass.

The number of units in one mole was found to be approximately 6.023 × 10 ²³  also called Avogadro’s constant.

Given, the mass of the AuPO₄  = 213.46 g

The molar mass of the AuPO₄ = 197 + 31 + 4(16) = 292 g/mol

The number of moles of the AuPO₄  = 213/292 = 0.729 mol

If the mole of AuPO₄  will produce one mole of the Au.

Then 0.729 mol of the AuPO₄ will produce Au = 0.729 mol

The mass of the Au (in grams) = 0.729 ×197 = 143.7 g/mol

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1) The solubility of the ions are;

lead II ions = 6.96 * 10^-4 M

iodide ions = 3.48 * 10^-4 M

2) The Ksp of silver chromate is 8.98 * 10^-22

We know that the Ksp has to do with the equilibrium constant that shows the extent to which a substance dissolves in water. We can see that the equation of the dissolution can be written for each of the reactants.

a) [tex]PbI2 (s) --- > Pb^{2+} (aq) + 2I^{-} (aq)[/tex]

Now we can see that the Ksp is obtained from;

Ksp = [[tex]Pb^{2+}[/tex]] [2[tex]I^{-}[/tex]]^2

Let the solubility be x

Ksp = 4x^3

x = ∛ 1.35 x 10^-9/4

x = 6.96 * 10^-4 M

Hence;

Concentration of lead II ions = 6.96 * 10^-4 M

Concentration of iodide ions =  6.96 * 10^-4 /2 = 3.48 * 10^-4 M

b) In order to obtain the solubility product of the silver chromate solution;

Let the solubility of each of the ions be x

We can see that;

Ksp = [3x]^3 [x]

Ksp = 3x^4

Ksp = 3(4.16 x 10^-6)^4

Ksp = 8.98 * 10^-22

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Answer:

See my photo. I promise it's right.

The concentration of the original HBr solution that has 25.0 mL solution neutralized with 13.7 mL of 0.230 M Ba(OH)₂ is 0.126M.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

Molarity can be calculated by using the following formula;

C₁V₁ = C₂V₂

Where;

According to this question, 25.0 mL solution of HBr is neutralized with 13.7 mL of 0.230 M Ba(OH)₂. The original concentration can be calculated as follows:

25 × x = 0.230 × 13.7

25x = 3.151

x = 0.126M

Therefore, 0.126M is the concentration of HBr solution.

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Answer:

a. Aluminum nitride

Explanation:

The compound AlN is a salt made up of Al and N.

Analyzing the oxidation states of each element, we can see that Aluminum acts with 3+ (because it has only one oxidation state), so Nitrogen need to interact with an oxidation state of 3-, for the molecule to be neutral.

Due to the nitrogen acts with 3- the name of the salt will be Aluminum nitride.

The 14 elements that make up the S-block are hydrogen (H), lithium (Li), helium (He), sodium (Na), beryllium (Be), potassium (K), magnesium (Mg), rubidium (Rb), calcium (Ca), cesium (Cs), strontium (Sr), francium (Fr), barium (Ba), and radium (Ra).

The Periodic Table's s-block elements are those in which the final electron enters the most outer s-orbital. Only two groups (1 & 2) are found in the s-block of the Periodic Table because the s-orbital can only hold two electrons.

S block elements' common outer electrical configuration is ns(1-2).

Given that it contains sodium, beryllium, magnesium, and lithium, I am rather certain that it contains alkaline metals.

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Answer:

good question but very hard

An acid-base reaction is a chemical reaction which takes place between an acid and a base. An example of acid-base reaction is AgNO₃(aq) + KF(aq) → AgF(s) + KNO₃(aq). Thus, the correct option is A.

An acid–base reaction is a chemical reaction which occurs between an acid and a base. This reaction can be used to determine the pH through the method of titration.

This reaction is a type of chemical reaction which involves the exchange of one or more hydrogen ions or protons (H⁺) between the two species which may be neutral (such as water, H₂O) or electrically charged species (ions such as ammonium, NH⁴⁺ and hydroxide, OH⁻; or carbonate, CO₃²⁻).

An example of acid-base reaction is  AgNO₃(aq) + KF(aq) → AgF(s) + KNO₃(aq).

Therefore, the correct option is A.

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The mass of forsterite Mg₂SiO₄ that contains a million, 1×10⁶ oxygen atoms is 5.819×10⁻¹⁷ g

We'll begin by obtinig the mass of oxygen that contains 1×10⁶ atoms. This can be obtained as follow:

From Avogadro's hypothesis,

6.02×10²³ atoms = 1 mole of oxygen.

But

1 mole of oxygen = 16 g

Thus,

6.02×10²³ atoms = 16 g of oxygen.

Therefore,

1×10⁶ atoms = (1×10⁶ atoms × 16 g) / 6.02×10²³ atoms

1×10⁶ atoms = 2.66×10⁻¹⁷ g of oxygen

Finally, we shall determine the mass of Mg₂SiO₄ that contains 1×10⁶ atoms (i.e 2.66×10⁻¹⁷ g) of oxygen. This can be obtained as follow:

Thus, we can say:

64 g of oxygen is present in 140 g of Mg₂SiO₄.

Therefore,

2.66×10⁻¹⁷ g of oxygen will be present in = (2.66×10⁻¹⁷ × 140) / 64 = 5.819×10⁻¹⁷ g of Mg₂SiO₄

Thus, the mass of Mg₂SiO₄ is 5.819×10⁻¹⁷ g

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The amount that could cause death in a 150 pound person is 675000 mg.

We define the LD 50 as the amount of the substance that could be used to cause mortality in about 50 percent of the population that is undergoing the test. In this case, we have been told that the  LD50 for Allura Red ingested for rats and rabbits is 10,000 mg/kg  an now we are asked for the LD 50 in a person that has a weight of 150-lb.

The first step in the work is to convert the mass of the person from pound to kilogram from here;

Given that

1 pound =  0.45 kilo gram

150 pounds = 150 pounds * 0.45 kilo gram/1 pound

= 67.5 Kg

Now, If

10,000 mg causes mortality in 1 Kg

x mg would cause mortality in 67.5 Kg

x = 675000 mg

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1. Convection currents are caused by Differences in water density.

2. Feeling heat from a campfire is an example of   heat transfer through convection.

3. Heat always flow from a warmer object to a cooler object.

4. The best description of convection is Heat transfer through movement in fluids.

Differential heating leads to convection currents. Warm, less dense, lighter material rises while cool, more dense, heavier material sinks. Convection currents are patterns of circulation that are produced by this movement in the Earth's mantle, oceans, and atmosphere.

The transfer of heat between two bodies by currents of moving gas or fluid is known as convective heat transfer. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.

Heat energy will always transfer from the warmer object to the cooler object under normal circumstances and in nature. Up until the two substances reach the same temperature, heat energy will transfer between them. The term "thermal equilibrium" describes this.

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According to the chemical equation, the reaction absorbs 54.8 kJ per 2 moles of NH4Cl because that's the stoichiometry coefficient of this molecule.

Now, we need to find the number of moles in each mole of NH4Cl.

Then, we add them to find the molar mass.

This means that 1 mole of NH4Cl equals 53.49 grams.

At last, we multiply the mass of NH4Cl (27.1 g) by two ratios, the first ratio is about the molar mass, and the second ratio is about the amount of heat per moles.

Therefore, the amount of energy that would be absorbed is 13.88 kJ.

Answer: i also need help on the same question :(

Explanation:

The pressure inside a tank with a volume can be calculated using Boyle's law. The pressure needed to compress gas of 3700 L is 16.75 atm.

According to Boyle's law the pressure of a system is inversely proportional to its volume. The mathematical expression for a system with pressure Pa and volume  V1 with its final pressure and volume P2 and V2 is written as follows:

P1V1 = P2V2.

The volume of the gas is 3700 L. Assume that it is measured in the atmospheric pressure 1 atm. The width of the spherical tank is 75 cm thus its radius is 37.5 cm.

Volume of the sphere = 4/3 πr³

                                     = 4/3 × 3.14 × (37.5)³

                                     = 220781 cm³ = 220.78 L.

Now the law can be applied as follows:

3700 L ×  1 atm = 220.78 L × P2

P2  = 3700 / 220.78

     = 16.75 atm.

Hence, the pressure needed to fill the air is 16.75 atm.

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The relative atomic masses of the elements are:

Lead = 206.96 amu

Magnesium =  24.62 amu

Silicon = 28.08 amu

The relative atomic masses of the given elements from their isotopes is determined as follows:

1. Lead:

Relative atomic mass = (203.973 * 0.014) + (205.974 * 0.236) + (206.759 * 0.226) + (207.9766 * 0.523)

Relative atomic mass = 206.96 amu

2. Magnesium:

Relative atomic mass = (23.985 * 79.99) + (24.986 * 10%) + (25.983 * 11.01%)

Relative atomic mass = 24.62 amu

3. Silicon:

Relative atomic mass = (27.977 * 92.21%) + (28.976 * 4.70%) + (29.973 * 3.09%)

Relative atomic mass = 28.08 amu

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Answer:

Na2CO3 + 2HC2H3O2 → CO2 + H2O + 2NaC2H3O2

Explanation:

Label Each Compound With a VariableLabel each compound (reactant or product) in the equation with a variable to represent the unknown coefficients.aNa2CO3 + bHC2H3O2 = cCO2 + dH2O + fNaC2H3O2Create a System of EquationsCreate an equation for each element (Na, C, O, H) where each term represents the number of atoms of the element in each reactant or product.Na: 2a + 0b = 0c + 0d + 1f

C: 1a + 2b = 1c + 0d + 2f

O: 3a + 2b = 2c + 1d + 2f

H: 0a + 4b = 0c + 2d + 3f

Solve For All VariablesUse substitution, gauss elimination, or a calculator to solve for each variable.

Simplify the result to get the lowest, whole integer values.

a = 1 (Na2CO3)

b = 2 (HC2H3O2)

c = 1 (CO2)

d = 1 (H2O)

f = 2 (NaC2H3O2)

Substitute Coefficients and Verify Result

Na2CO3 + 2HC2H3O2 = CO2 + H2O + 2NaC2H3O2

Reactants Products

Na 2 2 ✔️

C 5 5 ✔️

O 7 7 ✔️

H 8 8 ✔️

Since there is an equal number of each element in the reactants and products of Na2CO3 + 2HC2H3O2 = CO2 + H2O + 2NaC2H3O2, the equation is balanced.

To convert 100.0 g of water at 20.0 °C to steam at 100.0 °C requires 259.5 kJ of energy.

For this problem, there are only two heats to consider:

q

1

= heat required to warm the water from 20.0 °C to 100.0 °C.

q

2

= heat required to vapourize the water to steam at 100 °C.

q

1

=

m

c

Δ

T

=

100.0 g × 4.184 J

∘

C

−

1

g

−

1

×

80.0

∘

C

=

33 472 J

q

2

=

m

Δ

H

vap

=

100.0 g × 2260 J⋅g

−

1

=

226 000 J

q

1

+

q

2

=

( 33 472 + 226 000) J = 259 472 J = 259.5 kJ

(4 significant figures)

The equilibrium constant relates the concentrations of the products and reactants in the chemical equilibrium. To calculate it we can apply the following equation.

For the reaction: aA + bB ---> cC + dD

Equlibrium constant (Ke) will be:

The letters in square brackets refer to the concentration raised to the respective coefficient. Now we replace the known values:

So, the equilibrium constant (Ke) will be 3.2M

To calculate this, we can use fractions for equivalent amounts.

So, we have the number of atoms, using the Avogadro's Constant, we know that 1 mol of Mg is approximately 6.02 x 10^23, so:

And since we have the number of atoms of Mg, we can convert to mol of Mg by multiplying by this fraction.

Now, from mol of Mg we can convert to mass using the molar mass of 24.30 g/mol. It says that 24.30 g og Mg is equivalent to 1 mol, so:

So, we have:

Notice that this is presented in a table in the question, so we can now just multiply all of them:

Thus, this is equivalent of approximately 3.00 g of Mg.