A 725 MW power station with an electrical load factor and thermal efficiency of 70% and 42%, respectively, uses coal as a fuel source. The calorific value of the coal is 29.2 MJ/kg and the carbon content varies from 71 - 78%. The atomic mass of C, O, and N are 12, 16, and 14 g/mol, respectively. (i) Estimate the maximum CO2 emissions expected from the plant. (5 marks) (ii) If the nitrogen content of the coal is 0.25%, calculate the amount of NO2 produced by the station. (5 marks) (iii) The 'global warming potential index' of CO2 and NOx are 1 and 310, respectively. Determine the direct hourly CO2 equivalent for the station. (3 marks) (iv) In 1-2 sentences, explain the purpose and significance of calculating the direct hourly CO2 equivalent (as in part c). (2 marks).