The heat of solution of anhydrous and are and respectively. The heat of hydration of to is . The value of is (nearest integer).

Question

The heat of solution of anhydrous  and  are  and  respectively. The heat of hydration of  to  is . The value of  is  (nearest integer).

Canvas Classes · Accepted Answer

Strategy:
 Use Hess's Law to find the hydration enthalpy. The enthalpy of solution of the anhydrous salt is equal to the hydration enthalpy plus the enthalpy of solution of the hydrated salt.

Step 1: Set up the thermodynamic cycle
  ()
This can be broken into:
1.  ()
2.  ()

Step 2: Calculate

.
The magnitude  is .

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