A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is…

A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is…

A.
C2H2
B.
C3H3
C.
C4H4
D.
C5H5

Correct Answer: Option A
Explanation
% of H2 = 100 – 92.3 = 7.7%
mole = 92.3/12 7.7/1
7.1/7.1 7.1/7.1
empirical formula = CH
(CH)n = 26
(12 + 1)n = 26
(13)n = 26
n = 26/13 = 2
molecular formula = C2H2

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