Hexane (C6H14C_6H_{14}C6H14), dodecane (C12H26C_{12}H_{26}C12H26), and icosane (C20H42C_{20}H_{42}C20H42) are hydrocarbons obtained from the refining of crude oil.
Which statement regarding these three substances is correct?
They all have the same ratio of carbon-to-hydrogen atoms by mass, resulting in identical empirical formulas.
In a fractional distillation column, hexane condenses at a higher temperature (closer to the bottom) than icosane.
With a restricted oxygen supply, all three can undergo incomplete combustion to produce carbon monoxide and water.
A 1.0 g1.0\text{ g}1.0 g sample of each compound requires the exact same mass of oxygen for complete combustion.
130 exam-style questions on Edexcel GCSE Chemistry 9.1 Fuels, covering 9.1.1 Hydrocarbons and crude oil, 9.1.2 Fractional distillation of crude oil and its fractions, 9.1.3 The alkanes as a homologous series, 9.1.4 Complete and incomplete combustion, 9.1.5 Pollutants from burning fuels, 9.1.6 Hydrogen as a fuel and non-renewable fossil fuels, and 9.1.7 Cracking of larger alkanes. Each one has a worked solution and a mark scheme showing where the marks go.