Edexcel A-Level Chemistry A2 B 0 2 Ratios Fractions and Percentages Questions

Practise Edexcel IAL Chemistry 7.1.3 by calculating percentage composition, scaling yield and volume data, and reporting weighted means or percentage errors accurately.

Exam points

Calculate percentage by mass from formulae or repeat units, checking every carbonyl, chlorine or OH contribution.
Use percentage yield or composition to scale masses, volumes and land area with unit conversions.
Calculate weighted mean energy density and percentage error with appropriate significant figures.

[Maximum number: 1]

The reaction shown is at equilibrium. The forward reaction is endothermic.

\mathrm{C}(\mathrm{~s})+\mathrm{CO}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{CO}(\mathrm{~g})

At $680^{\circ} \mathrm{C}$ and $1 \mathrm{~atm}, 52.6 \%$ of the molecules in the gas mixture are carbon monoxide. What is the partial pressure of carbon dioxide, in atmospheres?

0.237

0.263

0.474

0.526

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Edexcel A-Level Chemistry A2 B 0 2 Ratios Fractions and Percentages Questions question 1