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At what temperature does the reduction of lead oxide to lead by carbon becomes spontaneous?
`PbO +C rarr Pb(s) +CO(g)`
For the reacion, `DeltaH` and `DeltaS` at `25^(@)C` are `108.4 kJ mol^(-1)` and `190 J K^(-1) mol^(-1)` respectively.

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`DeltaG = DeltaH - T DeltaS = 0`
or `T = (DeltaH)/(DeltaS) = (108.4)/(190xx10^(-3) = 570.5K`
Reaction will be spontaneous at temperature higher than `570.5K`,

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