Enthalpies of formation of CO_((g)) ,CO_(2(g)), N_(2) O_((g)) and N_(2) O_(4(g)) are -100, -393, 81 and 9.7 "kJ mol"^(-1) respectively. Find the value of Delta_(r) H for the reaction : N_(2) O_(4(g)) , 3CO_((g)) toN_(2)O_(4(g)) + 3CO_(2(g))

Enthalpies of formation of CO_((g)) ,CO_(2(g)), N_(2) O_((g)) and N_(2

1.	Enthalpies of formation of CO_((g)) ,CO_(2(g)), N_(2) O_((g)) and N_(2) O_(4(g)) are -100, -393, 81 and 9.7 "kJ mol"^(-1) respectively. Find the value of Delta_(r) H for the reaction : N_(2) O_(4(g)) , 3CO_((g)) toN_(2)O_(4(g)) + 3CO_(2(g))
Answer» SOLUTION :`Delta_(r) H= sum Delta_(r) H_("(products)") - sum Delta_(f) H_( "(REACTANTS)")` `= [Delta_(f) H(N_(2) O) + 3 Delta_(f) H (CO_(2) ) ]- [Delta_(f) H (N_(2) O_(4) ) + 3 Delta _(f) H (CO) ]` `= [81+3 (-393 ) ] - [9.7 + 3(-110) ]` `=-777.7 "kJ"`