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A 210 g iron bar is heated and then placed in 100. g of water in an insulated container. The water temperature increases from 21.2 °C to 53.3 °C. What was the initial temperature of the iron bar?

(Specific heats: cFe = 0.449 J/gK; cwater = 4.184 J/gK)

  • chemistry -

    heat lost by Fe + heat gained by H2O = 0
    [mass Fe x specific heat Fe x (Tfinal-Tinitial)] + [mass H2O x specific heat H2O x (Tfinal-Tinitial) = 0
    Substitute and solve for Tinitial for Fe.

  • chemistry -

    How much energy is required to heat 120.0g of water from 2.0°c to 24.0°c (Cp of H2O=4.184J/g

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