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At what relative humidity will copper sulfate pentahydrate lose its waters of hydration when the air temperature is 30°C? What is K_(p) for this process at this temperature? |
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Answer» SOLUTION :From the table, we see that the vapor PRESSURE of the hydrate is 12.5 torr, which corresponds to a relative humidity of 12.5/31.6 = 0.40 or 40%. This is the humidity that will be maintained if the hydrate is placed in a CLOSED container of dry air. For this hydrate,` Kp = P_(H_(2)O)^(5)` , so the PARTIAL pressure of water vapor that will be in equilibrium with the hydrate and the dehydrated solid (remember that both solids MUST be present to have equilibriumhArr), expressed in atmospheres, will be `(12.5//760)^(5) = 1.20 xx10^(–9)`. |
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