A nickel catalyst is used when an unsaturated oil reacts with hydrogen gas, H2\mathrm{H_2}H2. During the first 80 s, 960 cm3960\,\mathrm{cm^{3}}960cm3 of hydrogen, measured at room temperature and pressure, is used up.
What is the mean rate at which hydrogen is used up during the first 80 s, expressed as a mass per second?
(relative atomic mass: H = 1; 1 mol of any gas occupies 24 000 cm324\,000\,\mathrm{cm^{3}}24000cm3 at room temperature and pressure)
0.00050 g s−10.00050\,\mathrm{g\,s^{-1}}0.00050gs−1
0.080 g s−10.080\,\mathrm{g\,s^{-1}}0.080gs−1
0.0010 g s−10.0010\,\mathrm{g\,s^{-1}}0.0010gs−1
12 g s−112\,\mathrm{g\,s^{-1}}12gs−1
122 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.