1) In the heating system, coal whose original chemical analysis (% C = 28,% S = 1.5, % H2 = 2, % N2 = 1.5, 02 7,% Ash = 40) is used and 100 tons of coal is consumed annually. According to the assumption that the coal used is consumed by taking the ash and moisture to meet the same heat requirement; a) Calculate the lower calorific value of coal in both cases. (10p) b) Find the amount of coal consumed per year in dry and ash-free condition. (5p) c) Calculate the decrease in the amount of SO2 and water vapor released into the atmosphere.