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+//ques-2.22
+//Calculating weight of air theoretically required and weight of dry flue gas per kg of fuel and weight of air actually used
+clc
+C=624;//weight of carbon in coal (in g)
+H=41;//weight of hydrogen in coal (in g)
+O=69;//weight of oxygen in coal (in g)
+N=12;//weight of nitrogen in coal (in g)
+S=8;//weight of sulphur in coal (in g)
+moisture=151;//weight of moisture in coal (in g)
+ash=97;//weight of ash in coal (in g)
+w1=129;//weight of carbon dioxide in dry fuel gas (in g)
+w2=2;//weight of carbon monoxide in dry fuel gas (in g)
+w3=61;//weight of oxygen in dry fuel gas (in g)
+w4=808;//weight of nitrogen in dry fuel gas (in g)
+
+//Part (i)
+W=(C*(32/12)+H*(16/2)+S*(32/32)-O)*(100/23);//theoretical amount of air (in g)
+printf("Theoretical weight of air required for combustion of 1kg coal is %.3f kg.\n",W/1000);
+
+//Part (ii)
+m1=w2*(16/28);//weight of oxygen to convert CO to CO2 (in g)
+m2=w3-m1;//excess weight of oxygen/kg of flue gas (in g)
+m3=w1*(12/44)+w2*(12/28);//weight of C/kg of flue gas (in g)
+W_F=C/m3;//weight of flue gas/kg of coal burnt (in g)
+printf(" The weight of flue gas per kg of coal burnt is %.3f kg.\n",W_F);
+
+//Part (iii)
+W_O=W_F*(m2/1000);//weight of excess oxygen in flue gas (in kg)
+e=W_O*(100/23);//excess air/kg coal burnt (in kg)
+W_A=W/1000+e;//weight of actual air (in kg)
+printf(" The weight of air actually used is %.3f kg.",W_A);