A chemical plant uses a reaction pathway to make a ceramic pigment. In one batch, the mass of pigment isolated is 64 % of the maximum theoretical mass.
Which statement explains this shortfall?
The maximum theoretical mass was calculated from the limiting reactant
Some reactants formed an unwanted substance instead of the pigment
The pathway made the pigment at a fast rate during each batch
The pathway had a low atom economy for making the pigment
104 exam-style questions on AQA GCSE Chemistry 3.3 Yield and atom economy of chemical reactions, covering 3.3.1a Percentage yield, 3.3.1b Theoretical mass of a product, 3.3.2a Atom economy, and 3.3.2b Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.