Given: C + 2S to CS_(2), DeltaH = 117 kJ C + O_(2) to CO_(2), DeltaH = -393 kJ S + O_(2) to SO_(2) DeltaH = -297 kJ The heat of combustion of CS_(2) to form CO_(2) and SO_(2) is

Given: C + 2S to CS_(2), DeltaH = 117 kJ C + O_(2) to CO_(2), DeltaH

1.	Given: C + 2S to CS_(2), DeltaH = 117 kJ C + O_(2) to CO_(2), DeltaH = -393 kJ S + O_(2) to SO_(2) DeltaH = -297 kJ The heat of combustion of CS_(2) to form CO_(2) and SO_(2) is
Answer» `-1104 kJ"mol"^(-1)` `1104 kJ"mol"^(-1)` `+807 kJ"mol"^(-1)` `-807 kJ"mol"^(-1)` Solution :The required equation is `CS_(2) + 3O_(2) to CO_(2)+ 2SO_(2)` (i) ` C + 2S to CS_(2)DeltaH = 117 kJ` (ii) `C + O_(2) to CO_(2) DeltaH = -393 kJ` (iii) `S + O_(2) to SO_(2)DeltaH = -297 kJ` Multiply eqn.(iii) by 2 and subtract eqn(i) from it (iv) `CS_(2) + 2O_(2) to C _ 2SO_(2)DeltaH = -711 kJ` Add eqn.(ii) to eqn(iv) `CS_(2) + 3O_(2) to CO_(2)+2SO_(2)DeltaH = -1104 kJ`.