# Chemistry II

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Calculate the energy pulled from 500 grams of Water at 20.0 degrees Celsius to Ice at 0.0 degrees Celsius.

What happens to the energy?

How much Freon-11 must circulate through the freezer in order to freeze the 500 gram sample of Water?

• Chemistry II -

q1 = heat to move water from 20C to zero C.
q1 = mass H2O x specific heat water x (Tfinal-Tinitial).
q2 = heat to freeze 20 g H2O at zero C to ice at zero C.
q2 = mass water x heat fusion.
qtotal = q1 + q2.

qtotal = mass freon x heat vaporization if we assume 100% efficiency.

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