212. The dependence of the equilibrium constant Ca (OH) 2 (t) ⇌ CaO (t) H2O (g) on temperature is expressed by the equation lgK \u003d a / T blgT cT d with coefficients a \u003d -5650 K, b \u003d 0.670, c \u003d 4.14 × 10-4 K-1 ,d = 9.616. Calculate the equilibrium constant and enthalpy of this reaction at 700 K.

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