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Chemistry · Some Basic Concepts of Chemistry
हिन्दीWhat is the mass percentage of nitrogen in urea, \( \text{CO(NH}_2)_2 \)? (Atomic masses: \( \text{C} = 12, \text{O} = 16, \text{N} = 14, \text{H} = 1 \))
Correct answer · Option 3
46.67%
Explanation
Molar mass of urea = \( 12 + 16 + 2 \times (14 + 2) = 60\text{ g/mol} \). Mass of two N atoms = \( 28\text{ g} \). Mass % of N = \( \frac{28}{60} \times 100 = 46.67\% \).
