Question

# 9. Calculate ΔG0 at 820C for reactions in which (a) ΔH0= 293 kJ; ΔS0 = -695...

9. Calculate ΔG0 at 820C for reactions in which

(a) ΔH0= 293 kJ; ΔS0 = -695 J/K

(b) ΔH0= -1137 kJ; ΔS0= 0.496 kJ/K G0 = H0 -T S0

We use this formula for both the below questions

T = 820C = (82+273)K = 355K

(a) H0 = 293kJ = 293000J [Since 1kJ = 1000J] G0 = H0 -T S0  G0 = 293000J - (355K x -695J/K)  G0 = 293000J + 246725J = 539725J

(b) H0 = -1137kJ G0 = H0 -T S0  G0 = -1137kJ - (355K x 0.496kJ/K)  G0 = -1137kJ - 176.08kJ  G0 = 1313.08kJ = 131080J

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