Coding for the type of compound

3 marks · Normal

A hydrocarbon has 6 carbon atoms in a straight chain and is an alkane. Calculate the number of hydrogen atoms in one molecule of this compound.

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C6H14 hydrogen atoms (±0)

Also accept: 14; There are 14 hydrogen atoms in hexane

Common mistakes: Using n=5; Forgetting to use the general formula

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Marking points

M1 · 1 mark · States or uses the general formula for alkanes, CnH2n+2

M2 · 1 mark · Substitutes n = 6 correctly

A1 · 1 mark · Calculates and gives 14 hydrogen atoms (C6H14)

Worked solution

The general formula for alkanes is CnH2n+2.

So the alkane has 14 hydrogen atoms: C6H14.