# Compounds like CCl2F2 are known as chloroflurocarbons, 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. How many grams of this substance must evaporate to freeze 203g of water initially at 17°C.

Question

Compounds like CCl2F2 are known as chloroflurocarbons, 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. How many grams of this substance must evaporate to freeze 203g of water initially at 17°C.

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Step 1

Here we have to calculate first the amount of heat released when 203 g of water freezes.

Stepwise calculation shown in picture

Step 2

Amount of heat released in freezing water = heat used to vaporize CCl2F2

Calculat...

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