7.5 mL of a hydrocarbon gas was exploded with excess of oxygen. On cooling, it was found to have undergone a contraction of 15 mL. If the vapour density of the hydrocarbon is 14, determine its molecular formula. (C = 12, H = 1)

Explanation

To solve the problem, we need to determine the molecular formula of the hydrocarbon gas given the information provided. Let's break down the solution step by step.

### Step 1: Determine the Molecular Weight of the Hydrocarbon
Given that the vapor density of the hydrocarbon is 14, we can find the molecular weight using the formula:
\[ \text{Molecular Weight} = \text{Vapor Density} \times 2 \]
Substituting the given vapor density:
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