compound like CCl2F2 are known as CFCs and were only widely used as refrigerants

Question

compound like CCl2F2 are known as CFCs and were only widely used as refrigerants. breaking down of these molecules in the atmopsheres releases Cl atoms, each of which turn destorys many ozone molecules and has damaged the ozone layer. CFCs are being replaced by other compounds. The heat of evaporation of ClC2F2 is 289 J/g. What mas of this substance must evaporate in order to freeze 179.2g of water initially at 25.4 deg C. (the heat fusion of water is 334 j/g, the specific heat of water is 4.18 J/g deg C.

Explanation / Answer

Q to cool 179.2g water from 25.4 to 0 Q = 170*4.14*25.4=17876.52 j Q to freeze 170g water to ice Q = 179.2* 334 = 59852.8 j total heat lost by water = 77729.32 j 77729.32/289 = 268.96 g

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