A company makes an agricultural chemical by a process with an atom economy of 62% and a percentage yield of 47%.
The company changes the temperature and pressure of the process. The same reaction takes place.
Which statement about the effect of this change is correct?
The percentage yield could rise above 47%47\%47%, but the atom economy would stay at 62%62\%62%.
The atom economy could rise above 62%62\%62%, but the percentage yield would stay at 47%47\%47%.
The percentage yield and the atom economy could both rise above their present values.
Neither the percentage yield nor the atom economy could change from its present value.
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.