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Question

Acetylene and butene have empirical formula CH and CH2 respectively. The molecular mass of acetylene and butene are 26 g and 56 g respectively. Deduce their molecular formula.

A
C2H2 and C4H6
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B
C4H8 and C2H2
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C
C2H2 and C4H8
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D
C2H4 and C4H10
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Solution

The correct option is D C2H2 and C4H8
Empirical mass of acetylene is 13.
Empirical mass×n=Molecular mass
13n=26n=2.
Molecular formula=(CH)×2=C2H2
Empirical mass of butene is 14.
Empirical mass×n=Molecular mass
14n=56n=4.
Molecular formula =(CH2)×4=C4H8

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