Calcium chloride 6-hydrate, CaCl2•6H2O, dehydrates according to the equation CaCl2-6H20(s)=CaCl2(s)+6H2O(g) Kp=5.09×10-44, at 25°C What is the pressure of water vapor at equilibrium with a mixture of CaCl2•6H2O and CaCI2 at 25 °C?

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