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3 May, 16:39

Lithium iodide has a lattice energy of - 7.3 x 102 (kj/mol) and a heat of hydration of - 793 kj/mol. find the heat of solution for lithium iodide and determine how much heat is evolved or absorbed when 15.0 g of lithium iodide completely dissolves in water.

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  1. 3 May, 16:48
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    Given molecule Lithium iodide (LiI)

    Heat of hydration = - 793 kj/mol

    Lattice energy = - 730 kJ/mol

    Heat of hydration = Heat of solution - Lattice energy

    Heat of solution = Hydration + Lattice = - 793 + ( - 730) = - 1523 kJ/mol

    Now,

    Mass of LiI = 15.0 g

    molar mass of LiI = 134 g/mol

    # moles of LiI = 15/134 = 0.112 moles

    Heat of solution for 1 mole of LiI = - 1523 KJ

    Therefore, for 0.112 moles of LiI the corresponding heat is

    = 0.112 * (-1532) = 171.6 kJ
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