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March 28, 2017

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calculate the heat energy released when 25.8 g of liquid mercury at 25 C is converted to solid mercury at its melting point.

Constants for mercury at 1 atm:
heat capacity of Hg-->28.0
melting point-->234.32 K
enthalpy of fusion-->2.29 kj/mol

  • chemisty - ,

    q1 = heat released moving T from 298 to m.p.
    q1 = mass Hg x specific heat Hg x (Tfinal-Tinitial)

    q2 = heat released by freezing
    q2 = mass Hg x heat fusion(convert enthalpy fusion from kJ/mol to J/g OR change grams Hg to mols and kJ to J.

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