Discussion Forum



1)

The values of ΔH and ΔS for the reaction' C(graphite) + CO2 (g) → 2CO(g) are 170 kJ and 170 JK-1, respectively. This reaction will be spontaneous at


A) 910K

B) 1110 K

C) 510 K

D) 710 K

Answer:

Option B

Explanation:

ΔG = ΔH - TΔS

At equilibrium,ΔG = 0

→ 0 = (170 x 103 J) - T (170 JK-1)

→ T =1000 K

For spontaneity, ΔG is - ve, which is possible only if T > 1000 K.