1.

In conversion of lime-stone to lime CaCO_(3)(s) rarrCaO(s)+CO_(2)(g)the values of DeltaH^(@) and DeltaS^(@) are +179.1 kJ mol^(-1) and 160.2 J/K respectively at 298 K and 1 bar. Assuming that DeltaH^(@) do not change with temperature, temperatureabove which conversion of limestone to lime will be spontaneous is

Answer»

1008 K
1200
845 K
1118 K

Solution :We know, `DeltaG=DeltaH-TDeltaS`
So, LETS find the equilibrium TEMPERATURE, i.e. at which
`DeltaG=0, DeltaH-TDeltaS`
`T=(179.1xx1000)/(160.2)=1118 K`
So, at temperature above this, the REACTION will BECOME SPONTANEOUS.


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