A coal sample from Sarawak has an ultimate analysis by mass as shown in TABLE Q4. The coal is burned with 40% access air. a. b. C. Product d. Carbon, C Hydrogen, H Oxygen, O Nitrogen, N Sulfur, S Ash Air The enthalpy of formation of products C, H and S are -393520, -285830 and -297100 kJ/kmol, respectively. TABLE Q4 Percentage 67.4 5.31 15.11 1.44 2.36 8.38 Molar Mass (kg/kmol) 12 2 32 28 29 Calculate the mole number and the mole fractions of the constituents. [6 marks] Derive a balanced combustion equation with access air. [8 marks] Determine the molecular weight of the product gas and air fuel mass ratio. Determine the higher heating value (HHV) of the coal. [6 marks] [5 marks]