A process for making a water-treatment chemical has a percentage yield of 84% and an atom economy of 35%.
Which statement is correct?
35%35\%35% of the theoretical yield is collected, and the desired product accounts for 84%84\%84% of the total mass of products formed.
35%35\%35% of the reactant mass becomes the desired product, and 84%84\%84% of the total mass of products is waste.
84%84\%84% of the reactant mass becomes the desired product, and 35%35\%35% of the theoretical yield is collected.
84%84\%84% of the theoretical yield is collected, and the desired product accounts for 35%35\%35% of the total mass of products formed.
151 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.