Hydrocarbon A was cracked to form one molecule of heptane, C7H16C_7H_{16}C7H16, and one molecule of alkene B.
A→C7H16+B A \rightarrow C_7H_{16} + B A→C7H16+BThe relative formula mass (MrM_rMr) of B is 70. The empirical formula of B is CH2CH_2CH2.
Deduce the molecular formula of hydrocarbon A.
Show your working.
(Relative atomic masses: H=1.0H = 1.0H=1.0, C=12C = 12C=12)
258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.