Question

1. Burning of a particular hydrocarbon in the presence of oxygen gives equal volumes
of CO2 and water vapour under similar conditions of temperature and pressure. Find
out the empirical formula of the hydrocarbon.
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Answer 1

gas showed it to contain 2.5 g H and 7.5 g C, the percent composition would be calculated to be 25% H and 75% C:

\%\;\text{H} = \frac{2.5 \;\text{g H}}{10.0 \;\text{g compound}} \times 100 \% = 25 \%

\%\;\text{C} = \frac{7.5 \;\text{g C}}{10.0 \;\text{g compound}} \times 100 \% = 75 \%