How the physical properties of hydrocarbons change with molecule size
2 marks · EasyA sample of gasoline contains hydrocarbons with 8 carbon atoms per molecule. A sample of wax contains hydrocarbons with 30 carbon atoms per molecule. Calculate how many more carbon atoms per molecule are in wax than in gasoline.
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22 (±0)
Common mistakes: 8 - 30 = -22
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Marking points
M1 · 1 mark · Subtracts number of carbon atoms: 30 − 8.
A1 · 1 mark · Gives correct answer: 22. (follow-through)
Worked solution