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Gen. Chem

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Could you help me with this homework please..
105.0 g of water is in a Styrofoam calorimeter of negligible heat capacity. The initial T of the water is 17.1oC. After 288.2 g of an unknown compound at 77.0oC is added, the equilibrium T is 25.1oC. What is the specific heat of the unknown compound in J/(goC)?

  • Gen. Chem -

    heat lost by unknown compound + heat gained by H2O = 0

    [mass unknown x specific heat unk x (Tfinal-Tinitial)] +[mass H2O x specific heat H2O x (Tfinal-Tinitial)] = 0
    Substitute and solve for specific heat unknown.

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