H_f I_(g) = 106.84 kJ

IF_7(g) + I_2(s) -> IF_5(g) + 2 IF_(g) H = -87.54 kJ

Find the H^o_rxn for: IF_7(g) + 2 I_(g) -> IF_5(g) + 2 IF_(g) H^o = ________kJ

Hint use Hess' Law by turning H_f I_(g) = 106.84 kJ into a thermochemical equation (write out the formation reaction.)

Enter H^o in kJ. Include the sign but not the units. (Round to the nearest integer.) (IMPORTANT: do NOT leave a space between the "+" or "-" sign and the numerical value.)