Calculate the mass of 1.25 mol ammonium sulfide, (NH4)2S. *

Answers

Answer 1

Answer:

Answer:

85g

Explanation:

To convert the moles of a substance to grams we need to know the molar mass of the substance. We, as first, must obtain the molar mass of (NH₄)₂S as follows:

There are 2 atoms of N, 8 of H and 1 of S:

N = 2*14g/mol = 28g/mol

H = 8*1g/mol = 8g/mol

S = 1*32g/mol = 32g/mol

Molar mass: 68g/mol

That means 1 mole of (NH₄)₂S has a mass of 68g.

1.25moles have a mass of:

1.25moles * (68g/mol) =

85g

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A solution of KCIO3 is prepared using 75 grams of the solute in enough water to make 0.250 liters of solution. The gram-formula mass of KCIO3 is 122 grams per mole.-- Determine the percent by mass of solute in the solution.

Answers

The mass percent of the solute present is 99.7%.

What is mass percent?

The term mass percent refers to the ratio of the mass of solute to the mass of the solution multiplied by 100.

We have the following information;

volume of the water = 0.250 liters

Mass of the water = 0.250 g

Mass of the solute = 75 grams

Mas of solute and solvent = 0.250 g + 75 grams = 75.250 g

Mass percent of the solute = 75 grams /75.250 g * 100 = 99.7%

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Using the mass/volume percentage method for percentages of the solution, you simply divide the grams of solute by the volume of the solution and multiply by 100 to get your percentage.
(75.0g/250mL)•100 = 30.0% solute

The mass of a substance is the mass per mole of its entities, where the term entities can describe

Answers

Answer:

The molar mass of a substance is the mass per mole of its entities, where the term entities can describe atoms, molecules, ions or formula units.

Explanation:

Molar mass is the mass of any compound divided by mole. Means, if any chemical is given a specific molar mass it means this mass is being given by 6.022 × 10²³ entities of that chemical.

The molar mass of any compound is calculated by adding up the atomic masses of all atoms present in that chemical.

Example:

Molar Mass of H₂ = 1.008 + 1.008 = 2.016 g/mol

Molar Mass of NaOH = 23 + 16 + 1 = 40 g/mol

Molar Mass of HCl = 1 + 35.5 = 36.5 g/mol

A solution of NaOH is titrated with H2SO4. It is found that 20.05 mL of 0.3564 M H2SO4 solution is equivalent to 43.42 mL of NaOH solution. What is the concentration of NaOH?

Answers

Answer : The concentration of NaOH is, 0.336 M

Explanation:

To calculate the concentration of base, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2SO_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=2\nM_1=0.3564M\nV_1=20.05mL\nn_2=1\nM_2=?\nV_2=43.42mL$

Putting values in above equation, we get:

$2* 0.3564M* 20.05mL=1* M_2* 43.42mL$

$M_2=0.336M$

Thus, the concentration of NaOH is, 0.336 M

Which of the following most likely requires intermolecular forces?A.a spider walking on the bottom of a leaf
B.a rock maintaining its solid shape
C.a koala using claws to hold onto a tree

Answers

A rock maintaining its solid shape is one that required intermolecular forces. Thus, option (B) is correct.

What are the intermolecular forces?

Intermolecular forces are those forces that maintain chemical interactions between molecules of a substance and other types of particles present in the substance.

Rocks are constructed of different particles held together by various types of intermolecular forces depending on the kinds of particles present in the rock. Intermolecular forces can occur among molecules and other particles in a solid compound.

Intermolecular forces can either be attractive forces or repulsive forces. The molecules of opposite charges such as positive and negative charges can have attraction between them. While repulsion occurs between particles with similar charges such as between positive and positive charges.

The Intermolecular forces maintain the integrity of the structure of that compound. Intermolecular forces in compounds exist such as electrovalent bonds, covalent bonds, Vander Waals forces, hydrogen bonds, etc.

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A spider walkng on the bottem of the leaf

An increase in the average kinetic energy of a sample of copper atomsoccurs with an increase in(1) concentration (3) pressure(2) temperature (4) volume

Answers

I think the correct answer is in option 2. An increase in the average kinetic energy of a sample of copper atoms occurs with an increase in temperature because temperature is said to be directly proportional to the kinetic energy of the molecules. Therefore, increasing the temperature increases the kinetic energy of the molecules.

How many atoms are in 6.3 moles of calcium

Answers

1 mol --------- 6.02x10²³ atoms
6.3 moles ---- ??

atoms = 6.3 * 6.02x10²³

= 3.7926x10²⁴ atoms

hope this helps!

Final answer:

In 6.3 moles of calcium, there are approximately 3.79 x 10²⁴ atoms. This is calculated using Avogadro's number (6.022 x 10²³), which provides the number of atoms in a mole.

Explanation:

To find the number of atoms in 6.3 moles of calcium, you need to use Avogadro's number, which is 6.022 x 10²³. This number, known as Avogadro's constant, is the number of atoms or molecules in one mole of any substance. Therefore, you would calculate the number of atoms as follows:

6.3 moles of calcium × (6.022 x 10²³ atoms/mole) = 3.79 x 10²⁴ calcium atoms.

So, 6.3 moles of calcium have approximately 3.79 x 10²⁴ calcium atoms.

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