Calculate the volume of hydrogen gas needed to react completely with 250 dm3 of nitrogen gas to produce ammonia.
N2(g)+3H2(g)→2NH3(g) \text{N}_2\text{(g)} + 3\text{H}_2\text{(g)} \rightarrow 2\text{NH}_3\text{(g)} N2(g)+3H2(g)→2NH3(g)(All volumes of gases are measured under the same conditions of temperature and pressure.)
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.