A student has a sample of a liquid.
State a method the student uses to find out if the sample is pure.
The student finds out that the sample is a mixture containing octane, C8H18\text{C}_8\text{H}_{18}C8H18, and cyclooctane, C8H16\text{C}_8\text{H}_{16}C8H16.
What is the empirical formula of octane?
The boiling point of octane is lower than the boiling point of cyclooctane.
Describe a method the student could use to obtain a sample of pure octane from the mixture of cyclooctane and octane.
The student obtains 10.5 g10.5\text{ g}10.5 g of octane from 13.8 g13.8\text{ g}13.8 g of the mixture of octane and cyclooctane.
Calculate the percentage of octane obtained. Give your answer to 222 significant figures.
Octane reacts with oxygen in a combustion reaction.
Complete the balanced symbol equation for this reaction:
2C8H18+□ O2→□ CO2+□ H2O2\text{C}_8\text{H}_{18} + \Box\,\text{O}_2 \rightarrow \Box\,\text{CO}_2 + \Box\,\text{H}_2\text{O}2C8H18+□O2→□CO2+□H2O