3. The enthalpies of dissolution of MgSO4, MgSO4*H2O and MgSO4*7H2O are -84.85 -55.84 15.9 kJ/mol, respectively. What is the heat of hydration during the transition
a) MgSO4 to MgSO4*H2O
b) MgSO4 to MgSO4*7H2O
d) MgSO4*H2O to MgSO4*7H2O
What factors does the heat of dissolution depend on?

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