A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour density is 29, find its molecular formula (C = 12, H = 1).

Explanation

To find the molecular formula of the gaseous hydrocarbon containing 82.76% carbon and a vapor density of 29, we will follow these steps:

### Step 1: Determine the mass percentage of hydrogen
Given that the hydrocarbon is composed only of carbon and hydrogen, we can find the mass percentage of hydrogen by subtracting the mass percentage of carbon from 100%.

\[ \text{Mass percentage of H} = 100\% - 82.76\% = 17.24\% \]
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