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Question

The mass percentage of nitrogen in urea (NH2CONH2) is .

A
85
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B
47
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C
18
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D
28
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Solution

The correct option is B 47
Molecular mass of urea (NH2CONH2)
=2×Atomic mass of N + 4×Atomic mass of H + Atomic mass of C + Atomic mass of O=60

Mass percentage of nitrogen =Mass of an elementMass of compound×100=46.67 %

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