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2 January, 23:38

The energy released when Na + (g) and Cl - (g) form NaCl (s) is 778. kJ/mol. Approximately 162. J is absorbed from the surroundings when 2.35 g of NaCl is completely dissolved in water. What is the enthalpy of hydration of NaCl?

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  1. 3 January, 01:58
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    Answer: - 777.838

    Explanation:

    Given data,

    Lattice energy (energy released to form NaCl) = 778 kJ/mol

    Heat of solution = 162 Joules

    = 0.162 kJ (converted to kilojoules)

    Substitute the values in the given formula,

    Enthalpy of hydration = ΔHsolution - ΔHlattice energy

    = 0.162 - 778

    Therefore, Enthalpy of hydration = - 777.838
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