M-2 Mole Relationships

Question 1

The molar mass of CO₂ is 44 g/mol. What is the mass of 2 moles of CO₂?

Answer 1

88 g

Question 2

The molar mass of CO₂ is 44 g/mol. What is the mass of 0.5 moles of CO₂?

Answer 2

22 g

Question 3

The molar mass of CO₂ is 44 g/mol. What is the mass of 1 mole of CO₂?

Answer 3

44 g

Question 4

The molar mass of CO₂ is 44 g/mol. How many moles are in 11 g of CO₂?

Answer 4

0.25 mole

Question 5

The molar mass of CO₂ is 44 g/mol. How many moles are in 66g of CO₂?

Answer 5

1.5 mole

Question 6

The molar mass of CO₂ is 44 g/mol. How many moles are in 44g of CO₂?

Answer 6

1.0 mole

Question 7

Avogadro’s number is 6.0 x 10²³ particles/mol. How many moles of F₂ molecules can be found in 2.0 moles of F₂?

Answer 7

1.2 x 10²⁴ molecules

Question 8

Avogadro’s number is 6.0 x 10²³ particles/mol. How many moles of F₂ molecules can be found in 1.0 moles of F₂?

Answer 8

6.0 x 10²³ molecules

Question 9

Avogadro’s number is 6.0 x 10²³ particles/mol. How many moles of F₂ molecules can be found in 0.50 moles of F₂?

Answer 9

3.0 x 10²³ molecules

Question 10

Avogadro’s number is 6.0 x 10²³ particles/mol. How many moles of F₂ molecules can be found in 6.0 x 10²³ molecules of F₂?

Answer 10

1.0 moles

Question 11

Avogadro’s number is 6.0 x 10²³ particles/mol. How many moles of F₂ molecules can be found in 9.0 x 10²³ molecules of F₂?

Answer 11

1.5 moles

Question 12

Avogadro’s number is 6.0 x 10²³ particles/mol. How many moles of F₂ molecules can be found in 1.5 x 10²³ molecules of F₂?

Answer 12

0.25 moles

Question 13

Avogadro’s number is 6.0 x 10²³ particles/mol. How many moles of F atoms can be found in 6.0 x 10²³ molecules of F₂?

Answer 13

2.0 moles of F atoms

Question 14

What is the empirical formula of Hg₂Cl₂?

Answer 14

HgCl

Question 15

What is the empirical formula of NaCl?

Answer 15

NaCl

Question 16

What is the empirical formula of C₂H₆?

Answer 16

CH₃

Question 17

What is the empirical formula of P₄H₁₀?

Answer 17

P₂H₅

Question 18

Give a potential molecular formula for NO₂.

Answer 18

NO₂, N₂O₄, N₃O₆…

Question 19

Give a potential molecular formula for C₂H₃0.

Answer 19

C₂H₃O, C₄H₆O₂, C₆H₉O₃…

Question 20

How many moles of phosphorus atoms can be found 1.0 mole of H₃PO₄?

Answer 20

1.0

Question 21

How many moles of phosphorus atoms can be found 2.0 mole of H₃PO₄?

Answer 21

2.0 moles

Question 22

How many moles of phosphorus atoms can be found 0.50 mole of H₃PO₄?

Answer 22

0.50 moles

Question 23

How many moles of hydrogen atoms can be found 1.0 mole of H₃PO₄?

Answer 23

3.0 moles

Question 24

How many moles of hydrogen atoms can be found 2.0 mole of H₃PO₄?

Answer 24

6.0 moles

Question 25

How many moles of hydrogen atoms can be found 0.50 mole of H₃PO₄?

Answer 25

1.5 moles

Question 26

How many moles of oxygen atoms can be found 1.0 mole of H₃PO₄?

Answer 26

4.0 moles

Question 27

How many moles of oxygen atoms can be found 2.0 mole of H₃PO₄?

Answer 27

8.0 moles

Question 28

How many moles of oxygen atoms can be found 0.50 mole of H₃PO₄?

Answer 28

2.0 moles

Question 29

The molar mass of carbon is 12 g/mol. The molar mass of oxygen is 16 g/mol. What is the percent by mass of carbon in CO₂?

Answer 29

27.3% C

Question 30

The molar mass of carbon is 12 g/mol. The molar mass of oxygen is 16 g/mol. What is the percent by mass of oxygen in CO₂?

Answer 30

72.7% C

Question 31

The molar mass of carbon is 12 g/mol. The molar mass of oxygen is 16 g/mol. What is the mass of carbon in a 10. g sample of CO₂?

Answer 31

2.7 g of C

Question 32

The molar mass of carbon is 12 g/mol. The molar mass of oxygen is 16 g/mol. What is the mass of oxygen in a 10. g sample of CO₂?

Answer 32

7.3 g of C

Question 33

A sample of a compound made from carbon and oxygen contains 727 grams of oxygen and 273 g of carbon. Is this compound carbon dioxide?

Answer 33

The sample contains 27.3% carbon by mass and 72.7% oxygen by mass. These are the same percentages as CO₂ so it could be CO₂ but it also could be any formula that is a whole number multiple of CO₂ (i.e.; C₂O₄, C₃O₆, etc...)

Question 34

A sugar is made from carbon, hydrogen, and oxygen. A sample of the sugar is determine to contain 40.% carbon and 53% oxygen by mass. What percent of the mass comes from hydrogen?

Answer 34

7% (100-40-53)

Question 35

What is the mass of one mole of NH₃?

Answer 35

17.04 g for 1 mol of NH₃.

Question 36

What is the mass of one mole of Ca(OH)₂?

Answer 36

74.10 g for 1 mol of Ca(OH)₂.

Question 37

What is the mass of one mole of Fe₂(CO₃)₃?

Answer 37

291.73 g for 1 mol of Fe₂(CO₃)₃. (55.85\*2+12.01\*3+16\*9)

Question 38

What is the formula to calculate molar mass?

Answer 38

Molar mass = m/n

Question 39

What is the molar mass of a 10. gram sample of a substance that contains 0.50moles of that substance?

Answer 39

20. g/mol; Molar mass = m/n

Question 40

A sample of an unknown substance contains 0.25 moles of molecules when its mass is 52.5 g. What is its molar mass?

Answer 40

210 g/mol; Molar mass = m/n