alleryWhat is the percentage of hydrogen in water (H2O)?
A5.5 percent
B22.2 percent
C11.1 percent
D50 percent
Answer & Solution
Correct answer: C. 11.1 percent
1. Molar mass H2O = 18 g per mol.
2. Mass of H in 1 mole = 2 g.
3. Percentage = (2 / 18) * 100.
4. = 11.1 percent.
5. So water is about 11.1 percent hydrogen by mass.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 5 'Mole Concept and Stoichiometry'_
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