Two tablets from the same batch are each reacted with water. The reaction produces carbon dioxide.
In experiment A, the vessel is stoppered before the tablet and water are mixed.
In experiment B, the vessel remains open.
| experiment | vessel | mass before mixing in g | mass after the reaction in g |
|---|---|---|---|
| A | stoppered | 86.42 | 86.42 |
| B | open | 86.37 | 85.91 |
Assume that each reaction goes to completion. Ignore any evaporation or splashing.
Explain the results for experiments A and B.
A third experiment uses the same quantities of tablet and water as experiment B. All the carbon dioxide produced is collected in a separate container. The mass of this container before collection is 48.32 g.
Calculate the mass of the container and carbon dioxide after collection.
142 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.