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Question

Nitric acid contains approximately what percent hydrogen by mass?

A
2%
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B
5%
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C
7%
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D
10%
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E
20%
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Solution

The correct option is A 2%
Molecular weight of HNO3 is 63 grams.
It contains 1 gram of Hydrogen in it.
Thus, mass percent of Hydrogen present in it is 163 100, which is equal to 1.6 %
Thus, approximately, 2 % of Hydrogen is present by mass.
Option A is the correct answer.

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