a)
Petrol - 5460/114 = 47.89KJ/g
Kerosene - 10000/210 = 47.62KJ/g
Hydrogen - 285/2 = 142.5KJ/g
Ethanol - 1370/46 = 29.78KJ/g
Therefore Hydrogen provides the greatest amount of energy per gram.
b)
Mass of Petrol combusted = 0.69 * 1000 * 80 = 55200
n(Petrol) = m/mm
n(Petrol) =...