During a stage in a manufacturing process, a product is formed from a dissolved reactant. Over the concentration range used, the mean rate of product formation is directly proportional to the concentration of the dissolved reactant.
Using a concentration of 0.25 mol/dm3, the process forms 0.042 mol of product in 70 s.
The process is repeated using a concentration of 0.40 mol/dm3.
Calculate the time needed to form 0.072 mol of product using the higher concentration.
127 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.