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The standard enthalpies of formation of ions in aqueous solutions are obtained by arbitrarily assigning a value of zero to H ions; that is, ΔH o f [H+(aq)] = 0. (a) For the following reaction HCl(g) h2oarrow H+(aq) + Cl−(aq) ΔH o rxn = −74.9 kJ/mol calculate ΔH o f for the Cl− ions. kJ/mol (b) Given that ΔH o f for OH− ions is −229.6 kJ/mol, calculate the enthalpy of neutralization when 1 mole of a strong monoprotic acid (such as HCl) is titrated by 1 mole of a strong base (such as KOH) at 25°C. kJ/mol
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