Q: Which of the following best describes Avogadro's number?

$$6.02 \times 10$$^{23}$$ molecules in one mole of any substance

Q: If you have $$0.448$$ moles of carbon, how many carbon atoms do you have?

$$2.70 \times 10$$^{23}$$ atoms

Q: How many molecules are present in $$1$$ mole of $$CaSO_4$$?

$$6.02 \times 10$$^{23}$$ molecules

Q: Which equation correctly relates mass, molar mass, and moles?

$$\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}$$

Q: Which of the following statements about the mole is correct?

A mole is a counting unit equal to $$6.02 \times 10$$^{23}$$ entities

Q: Which of the following is the correct formula for calculating the number of atoms in a sample?

$$\text{Number of atoms} = \text{moles} \times 6.02 \times 10$$^{23}$$

Question 1

Which of the following best describes Avogadro's number?

Accepted Answer

$$6.02 	imes 10$$^{23}$$ molecules in one mole of any substance

Question 2

How many moles of carbon atoms are present in one mole of $$C_6H_8O_4$$?

Accepted Answer

6 moles

Question 3

If you have $$0.448$$ moles of carbon, how many carbon atoms do you have?

Accepted Answer

$$2.70 	imes 10$$^{23}$$ atoms

Question 4

What is the molar mass of silver ($$Ag$$)?

Accepted Answer

$$107.9 g/$$mol

Question 5

How many molecules are present in $$1$$ mole of $$CaSO_4$$?

Accepted Answer

$$6.02 	imes 10$$^{23}$$ molecules

Question 6

A sample contains $$0.35$$ moles of $$SeO_2. $$How many moles of oxygen atoms are present?

Accepted Answer

$$0.70$$ moles

Question 7

Which equation correctly relates mass, molar mass, and moles?

Accepted Answer

$$	ext{moles} = \frac{	ext{mass (g)}}{	ext{molar mass (g/mol)}}$$

Question 8

How many moles of $$NaCl$$ molecules are present in $$6.02 	imes 10$$^{23}$$ molecules of $$NaCl$$?

Accepted Answer

1 mole

Question 9

If you have $$24.0$$ grams of carbon, how many moles of carbon do you have?

Accepted Answer

$$2.00$$ moles

Question 10

Which of the following is the correct definition of molar mass?

Accepted Answer

The mass in grams of one mole of a substance

Question 11

A compound has the formula $$C_2H_6O. $$How many hydrogen atoms are present in $$2$$ moles of the compound?

Accepted Answer

$$24$$ moles

Question 12

Which of the following statements about the mole is correct?

Accepted Answer

A mole is a counting unit equal to $$6.02 	imes 10$$^{23}$$ entities

Question 13

How many moles of oxygen atoms are present in $$1$$ mole of $$H_2SO_4$$?

Accepted Answer

4 moles

Question 14

If you have $$0.25$$ moles of $$CaSO_4$$, how many moles of sulfur atoms do you have?

Accepted Answer

0.25 moles

Question 15

A sample contains $$0.448$$ moles of carbon. What is the mass of carbon in the sample?

Accepted Answer

$$5.38 g$$

Question 16

Which of the following is the correct formula for calculating the number of atoms in a sample?

Accepted Answer

$$	ext{Number of atoms} = 	ext{moles} 	imes 6.02 	imes 10$$^{23}$$

Question 17

How many moles of $$O$$ atoms are present in $$0.10$$ moles of $$Na_2SO_4$$?

Accepted Answer

$$0.40$$ moles

Question 18

If you have $$0.35$$ moles of $$SeO_2$$, how many moles of selenium atoms are present?

Accepted Answer

$$0.35$$ moles

Question 19

A sample contains $$1.00$$ mole of $$C_6H_{12}O_6$. How many moles of hydrogen atoms are present?

Accepted Answer

12 moles

Question 20

Which of the following best explains why the mole is a useful unit in chemistry?

Accepted Answer

It allows chemists to count atoms, molecules, or ions by weighing them

Moles, Avogadro’s Number, and Molar Mass in General Chemistry

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