A student has a liquid sample containing hydrocarbons.
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 hexane, C6H14\text{C}_6\text{H}_{14}C6H14, and cyclohexane, C6H12\text{C}_6\text{H}_{12}C6H12.
What is the empirical formula of hexane?
The boiling point of hexane is lower than the boiling point of cyclohexane.
Describe how the student could use the apparatus shown below to obtain a sample of pure hexane from the mixture of cyclohexane and hexane.
The student obtains 12.4 g12.4\text{ g}12.4 g of hexane from 18.5 g18.5\text{ g}18.5 g of the mixture of hexane and cyclohexane.
Calculate the percentage of hexane obtained. Give your answer to 222 significant figures.
Hexane reacts with oxygen in a complete combustion reaction.
Complete the balanced symbol equation for this reaction:
2C6H14+□ O2→□ CO2+□ H2O2\text{C}_6\text{H}_{14} + \Box\,\text{O}_2 \rightarrow \Box\,\text{CO}_2 + \Box\,\text{H}_2\text{O}2C6H14+□O2→□CO2+□H2O