A laboratory is assessing a synthesis used to prepare an analytical standard. The standard is the desired product and has a balancing number of 1 in the balanced equation.
| Quantity calculated from the balanced equation | Value |
|---|---|
| Atom economy for the standard | 70% |
| Sum of the Mr M_r\,Mr values for all other products, after applying balancing numbers | 42 |
What is the relative formula mass, MrM_rMr, of the standard?
98
140
29.4
60
152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.