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1. Given that 50 grams of ice is heated at -20.0 °C to steam at 135.0 °C.

i. Show the graph of the changes from ice to steam
ii. Calculate the energy needed to change the ice to steam
Please use these values:
Heat of fusion = 334.16 J g¯1
Heat of vaporization = 2259 J g¯1
specific heat capacity for solid water (ice) = 2.06 J g¯1 K¯1
specific heat capacity for liquid water = 4.184 J g¯1 K¯1
specific heat capacity for gaseous water (steam) = 2.02 J g¯1K¯1

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2 answers

  1. q1 = heat needed to raise T ice froom -20 to zero C.
    q1 = mass ice x specific heat ice x (Tfinal-Tinitial)

    q2 = heat needed to melt ice @ zero C to liquid water @ zero C.
    q2 = mass ice x heat fusion ice.

    q3 = heat needed to raise T water at zero to 100 C.
    q3 = mass water x specific heat H2O x (Tfinal-Tinitial)

    q4 = heat needed to convert water @ 100 C to steam at 100 C.
    q4 = mass water x heat vaporization

    q5 = heat needed to raise T of steam at 100 to steam at 135.
    q5 = mass steam x specific heat steam x (Tfinal-Tinitial)

    Total q = q1 + q2 + q3 + q4 + q5

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  2. 33kj

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