A certain hydrocarbon was found to contain only 18g of carbon and 4g of hydrogen in a 22g sample. Determine its Empirical formula

C₃H₈

Explanation:

First, convert mass to moles.

18g C (1 mol C / 12 g C) = 1.5 mol C

4g H (1 mol H / 1 g H) = 4 mol H

Multiply by 2 to get integers:

3 mol C and 8 mol H

The empirical formula is C₃H₈.

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