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.
Practise Edexcel GCSE Chemistry Fuels with exam-style questions for Foundation and Higher tier. 105 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
