The molar mass of a compound X is 56. its empirical formula is CH2. X is?

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A. butene.
B. butyne.
C. ethene.
D. propene.
E. propyne

Correct Answer:

Option A – butene

Explanation

(CH2)x=56
(12+2)x=56
14x=56
x=56/14
x=4
Hence, the empirical formula is (CH2)×4

= C4H8

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