An organic compound has the empirical formula CH2. If its molar mass is 42gmol−1, what is its molecular formula? (C = 12.0, H = 1.0)

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A. C2H4
B. C3H4
C. C3H6
D. C4H8

Correct Answer:

Option C = C3H6

Explanation

Given the molecular formula, CH2.

The empirical formula will be (CH2)n= 42

(12+(2×1))n=42
⇒ 14n=42
n = 3, hence the empirical formula is C3H6

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