STANDARD Chemistry Concentration MCQ Question
What is the mass per cent of oxygen in ethanol?
52.14%
13.13%
16%
34.78%
Correct Answer
Detailed Explanation
The molecular formula of ethanol is C₂H₅OH. The molar mass of ethanol is 46 g/mol, and the mass of oxygen is 16 g/mol. Therefore, the mass percent of oxygen is (16/46) × 100 = 34.78%.
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