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Q.

Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is,
Given : Atomic masses of C, H and N are 12,1 and 14 amu respectively.
The molar mass of the compound A is 162 g mol-1.

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a

C10H14N2

b

C2H3N

c

C5H7N

d

C4H6N2

answer is D.

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Detailed Solution

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C74%7412=6.166.161.23=5
N17.3%17.314=1.231.231.23=1
H8.7%8.71=8.78.71.23=7

Emperical formula =C5NH7

Emperical weight = 81

Multiplying  by a factor =16281=2

Then the Molecular formula =C10N2H14

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