Tungsten can be extracted from tungsten oxide, WO3\text{WO}_3WO3, by reaction with hydrogen.
150 tonnes of tungsten oxide was heated in a stream of hydrogen gas. The tungsten formed in the reaction was separated and purified. The mass of tungsten was then determined.
The results are shown in Table 1.
Use the information in Table 1 to calculate the percentage yield of tungsten in this process.
percentage yield=actual yieldtheoretical yield×100 \text{percentage yield} = \frac{\text{actual yield}}{\text{theoretical yield}} \times 100 percentage yield=theoretical yieldactual yield×100Give your answer to 1 decimal place.
Table 1
| Mass in tonnes | |
|---|---|
| Mass of tungsten oxide | 150.00 |
| Mass of tungsten produced | 92.40 |
| Theoretical mass of tungsten formed | 119.00 |
157 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.