A gaseous mixture of propane, acetylene and CO_(2) is burnt in excess of air. Total 4800 KJ heat is evolved . The volume of CO_(2) formed during combustion is 224 liters at STP. The total evolved heat is used to perform two separate process: (i) Vapourising 87.5% of water (liquid) obtained in the process of burning the original mixture. (ii) Forming 3808 litres ethylenemeasured at STP from its elements. DeltaH_(H-H) = 435 KJ//mol "" DeltaH_(C-H) = 416 KJ//mol "" DeltaH_(C-C) = 347 KJ//mol DeltaH_(C-C) = 615 KJ//mol, "" DeltaH_(C-C) = 812 KJ//mol"" DeltaH_("sublimation") "of " (C,s) = 718 KJ//mol DeltaH_(f)^(@)(C_(2)g) = -394 KJ//mol""DeltaH_(f)^(@)(H_(2)O, l) = -286 KJ//mol. "" DeltaH_(f)^(@)(H_(2)O,g) = -247 KJ//mol. Sum of enthalpies of combustion of C_(3)H_(8)(g) and C_(2)H_(2)g) is :

A gaseous mixture of propane, acetylene and CO_(2) is burnt in excess

1.	A gaseous mixture of propane, acetylene and CO_(2) is burnt in excess of air. Total 4800 KJ heat is evolved . The volume of CO_(2) formed during combustion is 224 liters at STP. The total evolved heat is used to perform two separate process: (i) Vapourising 87.5% of water (liquid) obtained in the process of burning the original mixture. (ii) Forming 3808 litres ethylenemeasured at STP from its elements. DeltaH_(H-H) = 435 KJ//mol "" DeltaH_(C-H) = 416 KJ//mol "" DeltaH_(C-C) = 347 KJ//mol DeltaH_(C-C) = 615 KJ//mol, "" DeltaH_(C-C) = 812 KJ//mol"" DeltaH_("sublimation") "of " (C,s) = 718 KJ//mol DeltaH_(f)^(@)(C_(2)g) = -394 KJ//mol""DeltaH_(f)^(@)(H_(2)O, l) = -286 KJ//mol. "" DeltaH_(f)^(@)(H_(2)O,g) = -247 KJ//mol. Sum of enthalpies of combustion of C_(3)H_(8)(g) and C_(2)H_(2)g) is :
Answer» `-2198` KJ/mol `-3499` KJ/mol `-2798` KJ/mol `-3099` KJ/mol Solution :N//A