NEET Chemistry Percentage Composition MCQ Question
What is the percentage composition by mass of hydrogen in water (H₂O)?
11.1%
33.3%
50.0%
66.7%
Correct Answer
Detailed Explanation
The molar mass of water is 18 g/mol (16 g/mol for oxygen and 2 g/mol for hydrogen). The mass of hydrogen in one mole of water is 2 g, so the percentage composition is (2/18) * 100 = 11.1%.
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