Percent Composition of a Compound

Question 3
One mole of nitrous acid (HNO2) contains 1.00 gram of hydrogen (H), 14.0 grams of nitrogen (N), and 32.0 grams of oxygen (O). What is the percent composition of oxygen in nitrous acid?

2.10%
29.8%
34.0%
68.1%

Question 4
A sample of calcium chloride (CaCl2) contains 100.2 grams of calcium (Ca) and 177.3 grams of chlorine (Cl). What is the percent composition of chlorine?

2.510%
36.10%
56.50%
63.89%

Question 6
The percent composition of carbon in glucose (C6H12O6) is:

25% C
40% C
7% C
None of these are correct.

Question 7
In the formula for carbon tetrahydride, CH4, the percent composition of all elements is:

75% C, 25% H
25% C, 75% H
81% C, 19% H
20% C, 80% H

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