1.

For the reaction between CO_2and graphite,CO_2(g) +C(s) to 2CO(g) , DeltaH = 170 kJ " and " Delta S = 179 JK^(-1)At equilibrium, the reaction will be non-spontaneous at

Answer»

300K
500K
900K
1100K

Solution :For EQUILIBRIUM `DELTA G = 0= Delta H- T Delta S`
` T = (Delta H)/(Delta S) = (170 xx 10^3)/(170) = 1000 K`
The reaction would be non-spontaneous at TEMPERATURE less than 1000 K, so as to have `Delta G`positive. 5


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