The standard enthalpies of formation of ions in aqueous
The standard enthalpies of formation of ions in aqueous solutions are acquired by arbitrarily assigning a value of zero to H+ ions that is, Hf [H+ (aq)] = 0. For the subsequent reaction- HCl (g) --H20---> H+ (aq) + Cl- (aq) Hf = -74.9 kJ/mol
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