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Question

The reaction,
MgO(s)+C(s)Mg(s)+CO(g),
For which rHo=+491.1kJ mol1andrS=198.0JK1mol1 is not feasible at 298 K. Temperature above which reaction will be feasible is

A
2040.5K
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B
1890.0K
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C
2480.3K
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D
2180.5K
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Solution

The correct option is C 2480.3K
G=HTS
For a reaction to be spontaneous G must be negative or less than zero i.e.,HTS<0
T>HST>491.1×1000198T>2480.3K.
So , the reaction will be feasible above the temperature 2480.3K

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