If the bond energies of H $-$ H, Br $-$ Br, and H $-$ Br are 433, 192 and 364 kJ mol$-$1 respectively, the $\Delta $Ho for the reaction H2(g) + Br2(g) $ \to $ 2HBr(g) is

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^o for the reaction

H₂_(g) + Br_2(g) $ \to $ 2HBr_(g) is

$-$ 261 kJ