Solution:
The temperature at which given reaction exists as equilibrium is
At of the reaction will be negative and hence the given reaction will be spontaneous.
In conversion of lime-stone to lime, he values of and are and respectively at 298 K and 1 bar. Assuming that and do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is
The temperature at which given reaction exists as equilibrium is
At of the reaction will be negative and hence the given reaction will be spontaneous.