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March 25, 2017

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Determine the amount of heat needed to raise 20.0 g of ice at 0 degrees C to steam at 100 degrees C. (ΔHfusion = 334 J/g; Specific heat of (H2O) = 4.18 J/gc; ΔHvap = 2.25 kJ/g)

  • chemistry - ,

    q1 = heat to melt ice.
    q1 = mass ice x heat fusion.

    q2 = heat need to raise temperature for liquid water from zero C to liquid water at 100 C.
    q2 = mass melted ice x specific heat water x (Tfinal-Tinitial)

    q3 = heat needed to vaporize the steam at 100 C.
    q3 = mass water x heat vaporization.

    Total Q = q1 + q2 + q3.

  • chemistry - ,

    i am getting 60040J. Is that correct?

  • chemistry - ,

    60.040 kJ is correct.

  • chemistry - ,

    Ok I see. thank you very much :-)

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