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+//ques-2.19
+//Calculating amount of air for combustion and amount of dry products in fuel gas
+clc
+C=90;//Percentage of carbon in fuel
+H=6;//Percentage of hydrogen in fuel
+S=2.5;//Percentage of sulphur in fuel
+O=1;//Percentage of oxygen in fuel
+ash=0.5;//Percentage of ash in fuel
+M=1;//Mass of fuel given (in kg)
+e=25;//Percentage of excess air used
+
+//Part (i)
+m1=(C/100)*M*1000;//mass of carbon in fuel (in g)
+m2=(H/100)*M*1000;//mass of hydrogen in fuel (in g)
+m3=(2.5/100)*M*1000;//mass of sulphur in fuel (in g)
+m4=(O/100)*M*1000;//mass of oxygen in fuel (in g)
+m5=(ash/100)*M*1000;//mass of ash in fuel (in g)
+W=(m1*(32/12)+m2*(16/2)+m3*(32/32)-m4)*(100/23);//Weight of air for complete combustion (in g)
+printf("The amount of air required for complete combustion of 1kg of fuel is %.3f kg.\n",W/1000);
+
+//Part (ii)
+//When excess air is being used
+w1=m1*(44/12);//weight of carbon dioxide (in g)
+w2=m2*(64/32);//weight of sulphur dioxide (in g)
+w3=W*(77/100)*(1+e/100);//weight of nitrogen (in g)
+w4=m4+W*(23/100)*(1+e/100);//weight of oxygen (in g)
+total=w1+w2+w3+w4;//total weight of dry products (in g)
+p1=(w1/total)*100;//Percentage of carbon dioxide
+p2=(w2/total)*100;//Percentage of sulphur dioxide
+p3=(w3/total)*100;//Percentage of nitrogen
+p4=(w4/total)*100;//Percentage of oxygen
+printf(" The percentages of carbon dioxide, sulphur dioxide, nitrogen and oxygen in dry products are %.2f, %.2f, %.2f and %.2f respectively.",p1,p2,p3,p4);