Fine spirits distillation provides a product which is 61% ethanol (C2H5OH) by volume. How much water, in litres, needs to be added to 20 L of this distillate to bring the alcohol content down to 43% by volume for bottling? (2 marks) O a. 17.5 O b. 8.4 O c. 14.1 O d. 7.6 Up to 20% hydrogen in methane can be transported in the normal natural gas network and used by the customers just as natural gas alone can be. Consider a methane - hydrogen mixture which has a hydrogen partial pressure of 0.24 atm and a total pressure of 1.20 atm and at 25C, in view of the facts that the energy densities of hydrogen and methane are 142 and 55 Mj/kg, respectively. Such a mixture has an enhanced energy density relative to methane alone. (2 marks) O True O False 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 20C is processed per day, what would be the daily mass of methane available? (2 marks) O a. 5.7 kg O b. 0.57 Tonnes OC. 1.8 x 105 g d. 3.5 x 104 g