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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

Answer

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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