In one roasting unit, an ore concentrate of the composition 21%Cu2S,40%FeS2,31%SiO2 and 8%H2O is roasted using air. The roasting unit is heated by oil of composition 85%C and 15% H, and the amount of oil is 5.2% of the weight of the ore. Air for combustion and roasting is 110% in excess of the theoretical requirement. The gases from combustion and roasting mix together and are carried through as flue. S passes as SO2. The roast product consists of CuO,Fe2O3 and SiO2. Calculate per 1000kg of ore concentrate treated: (a) The weight of roasted product (b) Cubic meter of air (i) at 1atm and 273K and (ii) at 1atm and 973K (c) Amount of H2O / cubic meter of flue gas