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Thermodynamics

Question
CBSEENCH11008386
Wired Faculty App

The values of ΔH and ΔS for the reaction, C(graphite) + CO2(g) → 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
increment straight G space equals space increment straight H minus straight T increment straight S Given comma space increment straight H space equals space 170 space kJ increment straight S space equals space 170 space JK to the power of negative 1 end exponent straight T space equals ? increment straight G space equals space increment straight H minus space straight T increment straight S 0 less than 170 space straight x space 10 cubed space minus space straight T space straight x space 170 straight T greater than 1000 straight T minus 1110 space straight K

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