An investigator monitors the thermal decomposition of sodium hydrogencarbonate powder in an open crucible. The decrease in mass of the crucible and its contents is recorded after heating, due to the release of carbon dioxide gas and water vapour. The experiment is performed four times under identical conditions, yielding the following mass losses:
Determine the range of the four recorded mass losses.
Calculate the mean mass loss, ensuring you identify and exclude the anomalous result from your calculation.
53 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.