Edexcel IGCSE Chemistry 1.26 Relative Formula Mass Questions

Practise finding Mr from Ar values and formula subscripts, including molecular formulae, brackets and atom counts in displayed formulae.

Exam points

calculate Mr by multiplying each Ar by the number of atoms in the formula
interpret brackets and subscripts in formulae
use molecular mass data and Ar to infer the number of atoms in a molecule

[Maximum number: 1]

Crude oil is a mixture of hydrocarbons.

One of the hydrocarbons in the refinery gas fraction is an alkane with the structural formula $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$

Calculate the relative molecular mass $\left(M_{\mathrm{r}}\right)$ of this alkane.

M_{r}=

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Edexcel IGCSE Chemistry 1.26 Relative Formula Mass Questions question 1