Answer to Question #212479 in Organic Chemistry for Pyun

Question

Given the following reactions, calculate the heat of formation of hydrazine in megajoules.

(A) H_2(g)+1/2 O_2(g) -> H₂O_(g) ΔH= -241.8 kJ

(B) N₂N_4(l)+O_2(g) -> N_2(g)+2H₂O_(g) ΔH= -534.2 kJ

Answer 1

Heat formation $= (-534+-241.8)kJ=-775kJ$

In megajoules =$-7.75×10^{-4}$