The client has enquired whether it would be more economical to provide heat using hydrogen boilers, with 100% fractional conversion of hydrogen, producing water in the gas phase. The reactants (hydrogen and air, in stoichiometric and dry conditions) enter the boiler at 25C, and the products leave at 250C. Given that the cost of hydrogen is 8.50/kg and of green electricity is 67.2p/kWh (p cents of ): (i) Verify and justify the suggestion. [20 marks] (ii) Critical discussion/comparison between