Chemistry · The Second & Third Laws · Free Energy & Chemical Equilibrium
Problem
Tin is obtained from cassiterite by reduction with coke. Use the data given below to determine the minimum temperature (in K) at which the reduction of cassiterite by coke would take place. At 298 K: ΔfH°(SnO₂(s)) = −581.0 kJ mol⁻¹, ΔfH°(CO₂(g)) = −394.0 kJ mol⁻¹, S°(SnO₂(s)) = 56.0 J K⁻¹ mol⁻¹, S°(Sn(s)) = 52.0 J K⁻¹ mol⁻¹, S°(C(s)) = 6.0 J K⁻¹ mol⁻¹, S°(CO₂(g)) = 210.0 J K⁻¹ mol⁻¹. Assume that the enthalpies and the entropies are temperature independent.