A student investigated the reaction between magnesium carbonate powder and dilute nitric acid by measuring the decrease in mass of the flask and its contents as carbon dioxide gas was released. The experiment was repeated four times under identical conditions. The results are: Result 1: 1.12 g1.12\text{ g}1.12 g; Result 2: 1.15 g1.15\text{ g}1.15 g; Result 3: 0.61 g0.61\text{ g}0.61 g; Result 4: 1.18 g1.18\text{ g}1.18 g.
What is the range of the four results?
Calculate the mean decrease in mass, making sure to exclude the anomalous result.
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.