Question 1

If you have 3 moles of oxygen gas (O2), how many molecules of oxygen do you have?

Accepted Answer

1.81 x 10^24 molecules

Answer

3.01 x 10^23 molecules

Answer

6.02 x 10^23 molecules

Answer

9.03 x 10^23 molecules

Question 2

What is the mass in grams of 2 moles of carbon dioxide (CO2)?

Accepted Answer

88 grams

Answer

44 grams

Answer

22 grams

Answer

66 grams

Question 3

How many grams of water (H2O) are in 0.5 moles?

Accepted Answer

9 grams

Answer

4.5 grams

Answer

18 grams

Answer

36 grams

Question 4

What is the number of atoms in 0.25 moles of sodium (Na)?

Accepted Answer

1.505 x 10^23 atoms

Answer

12.04 x 10^23 atoms

Answer

3.01 x 10^23 atoms

Answer

6.02 x 10^23 atoms

Question 5

How many moles of chlorine gas (Cl2) are there in 141 grams?

Accepted Answer

2 moles

Answer

0.5 moles

Answer

1 mole

Answer

4 moles

Question 6

What is the total number of moles in 24 grams of carbon (C)?

Accepted Answer

2 moles

Answer

3 moles

Answer

0.5 moles

Answer

1 mole

Question 7

How many moles are there in 98 grams of sulfuric acid (H2SO4)?

Accepted Answer

1 mole

Answer

4 moles

Answer

0.5 moles

Answer

2 moles

Question 8

What is the percent composition of carbon in ethene (C2H4)?

Accepted Answer

85.71%

Answer

40%

Answer

14.29%

Answer

60%

Question 9

What is the percent composition of oxygen in water (H2O)?

Accepted Answer

88.89%

Answer

11.11%

Answer

75%

Answer

50%

Question 10

What is the percent composition of sodium (Na) in sodium chloride (NaCl)?

Accepted Answer

39.34%

Answer

60.66%

Answer

50%

Answer

25%

Question 11

What is the percent composition of hydrogen in ammonia (NH3)?

Accepted Answer

17.76%

Answer

82.24%

Answer

25%

Answer

10.00%

Question 12

What is the percent composition of chlorine in calcium chloride (CaCl2)?

Accepted Answer

64.07%

Answer

50%

Answer

35.93%

Answer

75%

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