chemistry

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hi need help for these questions
a. which of the ions Cs+, Sr 2+, Ba 2+, will have the largest heat of hydration?which is the smallest?
b. of the two compounds NaF and MgF2,which has the strongest intermolecular forces?
c. of the two compounds NaNO3 and HF, which has the strongest intermolecular forces?..thnks

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