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An organic compound has the empirical formula $CH_{2}$ . If...

An organic compound has the empirical formula $CH_{2}$ . If its molar mass is 42 $gmol^{-1}$ , what is its molecular formula? (C = 12.0, H = 1.0)

A.

$C_{2}H_{4}$

B.

$C_{3}H_{4}$

C.

$C_{3}H_{6}$

D.

$C_{4}H_{8}$

View answer & explanation

Correct answer is C

Given the molecular formula, $CH_{2}$ .

The empirical formula will be $(CH_{2})n$ = 42

$(12+(2\times1))n =42$

⇒ $14n =42$

n = 3, hence the empirical formula is $C_{3}H_{6}$

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