Marble chips react with hydrochloric acid in an open flask on a balance. The mass decreases by 0.44 g in the first 50 s. Assume the loss in mass is due only to carbon dioxide escaping.
What is the mean rate of production of carbon dioxide in the first 50 s, as a volume at room temperature and pressure?
(relative atomic masses: C = 12, O = 16; 1 mol of any gas occupies 24 000 cm324\,000\,\mathrm{cm^{3}}24000cm3 at room temperature and pressure)
0.0048 cm3 s−10.0048\,\mathrm{cm^{3}\,s^{-1}}0.0048cm3s−1
240 cm3 s−1240\,\mathrm{cm^{3}\,s^{-1}}240cm3s−1
7.5 cm3 s−17.5\,\mathrm{cm^{3}\,s^{-1}}7.5cm3s−1
4.8 cm3 s−14.8\,\mathrm{cm^{3}\,s^{-1}}4.8cm3s−1
54 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.