Compounds like CCl 2 F 2 are known as chlorofluorocarbons, or CFCs. These compou

Question

Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g.

Part A

What mass of this substance must evaporate in order to freeze 240g of water initially at 15?C? (The heat of fusion of water is 334 J/g; the specific heat of water is 4.18 J/g?K.)

Express your answer using two significant figures.

m=

Explanation / Answer

For the CFC we have: Q1 = m x Hvap For the water: Q2 = m2 x s x T + m x Hfus

Q1 = Q2

m = m2 x s x T + m x Hfus / Hvap = 240 x 4.18 x (288 - 273) + 240 x 334 / 289

m = 329.43 g

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