Answer: B
Charge =40000×36000=1.44×109 C, i.e. 14922.3 mol of electrons. Al: 14922.3/3=4974.1 mol =134.30 kg. For one CO plus one COX2 the carbon gives 2+4=6 electrons from 2 C atoms, i.e. 3 electrons per carbon, so C =14922.3/3=4974.1 mol =59.69 kg.