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An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be:

1. CH3O
2. CH2O
3. CHO
4. CH4O

Correct answer: CH2O

Solution

To find the empirical formula, divide the given percentages by the atomic masses of the elements: C (38.71/12), H (9.67/1), and O (100 - 38.71 - 9.67 = 51.62/16). The resulting mole ratio simplifies to CH2O.

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