Question

Calculate the AH for the reaction 2S+20F₂ (a)

+SF) 2 (9)

using the following thermochemical reactions. + 2HF

AH = -277 kJ

AH = -828 kJ

0₂ (9) SO ₂ (0) (g) +4HF OF 2 (0) SF 4 (g) (0) + 2H₂O

AH = -297 kJ

+0₂ 2(g) 2 (g)

Answer 1

$2S_{(g)}+2OF_{2(g)}\to\>SO_{2(g)}+SF_{4(g)}\>\>\>\Delta\>H^{\theta}_{rxn}$ ..

The heat of reaction

$\Delta H^{\theta}_{rxn}=2(-277)-(-828)+2(-297)$

$=-320kJ$