General formulae
2 marks · NormalGive the general formula for alkanes and state the formula for butane.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Also accept: CnH2n+2 and C4H10
Common mistakes: Giving the wrong general formula (e.g. for alkenes); Incorrectly calculating the formula for butane
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States CnH2n+2 as the general formula.
B2 · 1 mark · States C4H10 as the formula for butane.
Worked solution
The general formula for alkanes is CnH2n+2. The formula for butane is C4H10.