In conversion of limestone to lime, <br> CaCO3(s)→CaO(s)+CO2(g) <br> the values of ΔH∘ and ΔS∘ are +179.1kJmol−1 and 160.2J/K respectively at 298 K and 1 bar. Assuming that ΔH∘ and ΔS∘ do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is :