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Using rounded atomic masses, what percent by mass of N is in nitric acid (HNO3)?

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A) 77.8%

B) 32.2%

C) 22.2%

D) 12.2%

Answer: C

Explanation: The formula mass is about 63 g/mol; N contributes 14 g per mole. Divide 14 by 63 and multiply by 100 to obtain about 22.2%.

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