Setting up the Keq expression:
Calcium chloride 6−hydrate, CaCl2∙6H2O, dehydrates according to the equation
CaCl2·6H2O(s) ⇌ CaCl2(s) + 6H2O(g) KP = 5.09 x 10−44 at 25°C
What is the pressure of water vapor at equilibrium with a mixture of CaCl 2∙6H2O and CaCl2?
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