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Electrochemistry

Question

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

710 K

910 K

1110 K

510 K

Solution

C.

1110 K

For spontaneous process, ΔG < 0
ΔG = ΔH - TΔS
Given , ΔH = 170 KJ = 170 x 10³ J
ΔS = 170 JK^-1
T = ?
ΔG = ΔH - TΔS

0 < 70 x 10³ - T x 170
T > 1000
T = 1100 K

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