7 A sample of 'raw' natural gas comes out of the ground with, in molar terms, the following composition: 85.0% methane, 3.4% carbon dioxide, 7.7% ethane and 3.9% propane. As part of the purification of methane for distribution, the latter two hydrocarbons are captured for another use. If a million litres of raw gas at atmospheric pressure and 20oC is processed per day, what would be the daily mass of methane available? (2 marks)

8

The production of concrete accounts for about 7% of the global emissions of CO ₂, and about half of that total comes from the first step, strongly heating calcium carbonate (limestone) to drive off CO ₂ as follows:

CaCO₃(s) CaO(s) + CO₂(g)

If a lab trial of the process were started with 24.6 g of calcium carbonate, run at 500^oC and CO₂ was 'captured' in a 5.50 L flask at 850 Torr and 55^oC, what is the efficiency of CO₂ capture? (2 marks)

9. The Ford Coyote 5.0 L V-8 engine has a bore (diameter) and stroke of 92.2 and 92.7 mm, respectively, and a compression ratio of 12.0. If the mixture of gases (air + octane) in a cylinder (area = r ² ) before compression is at 1.5 atm and 300 K, what would be the pressure (assume ideal gas behaviour) at 400 K after compression (i.e.-just before ignition)? (2 marks)