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Question

The mass percentage of nitrogen in urea (

NH2CONH2


) is .


A
85.92
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B
46.67
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C
18.23
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D
28.58
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Solution

The correct option is B 46.67
Molecular mass of urea (NH2CONH2) is
= 2× (Atomic mass of N ) + 4 × (Atomic mass of H) + (Atomic mass of C) + (Atomic mass of O) = 60

Mass percentage of N = Total mass of N atoms in the compoundMass of compound×100=2860×100=46.67%

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