Question

If the bond energies of H - H, Br - Br, and H-Br are 433, 192 and 364 kJ mol⁻¹ respectively, the $\Delta H^0$ for the reaction $H_2(g) + Br_2(g) \rightarrow 2HBr(g)$ is
(a) – 261 kJ
(b) + 103 kJ
(c) + 261kJ
(d) – 103 kJ

Answer 1

The first is the right answer