The empirical formula of a hydrocarbon is $C H_{3} .$ It's molecular weight is $30$ , What is molecular formula of the compound.

C H_{4}

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C_{2} H_{6}

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C_{3} H_{8}

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C_{4} H_{10}

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Solution

The correct option is B $C_{2} H_{6}$
Formula for finding molecular formula is
Molecular formula= n x Empirical formula
Now n = molecular weight / empirical weight
therefore n = 30/15
Where 15 is the weight of the empirical formula CH3
n=2
Now the molecular formula = 2 x CH3
= C2H6
Therefore the answer option B is correct.

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