The standard reaction enthalpy of Zn(s) + H2O(g) → ZnO(s) + H2(g) is approximately constant at +224 kJ mol−1 from 920 K up to 1280 K. The standard reaction Gibbs energy is +33 kJ mol−1 at 1280 K. Estimate the temperature at which the equilibrium constant becomes greater than 1.

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