A pharmaceutical company makes paracetamol in batches. A batch is passed for packing only if its percentage yield is at least 75%.
For one batch, the theoretical yield of paracetamol is 60.0 kg. The crystals have a mass of 63.0 kg when they are first filtered off and 46.2 kg after drying in an oven.
Calculate the percentage yield of the batch using the mass after drying.
Evaluate whether the batch should be passed for packing. Use the data to explain why the mass before drying should not be used to make this decision.
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.