The chlorofluorocarbon CCl2F2 was once used as a refrigerant

Chemistry May 23, 2021

The chlorofluorocarbon CCl2F2 was once used as a refrigerant. What mass of this substance must evaporate to freeze 2 mol water initially at 20°C? (ΔHvap for CCl2F2 is 289 J/g; ΔHfus for solid ice is 6.02 kJ/mol; specific heat capacity for liquid water is 4.184 J/g•°C)

Expert Solution

Answer:

mass of CCl2F2 must evaporate = 52.1 gm

Step-by-step explanation

2 mole water = 36 gm

heat released by water = m1 * s1 * dT1 + n1 * Lf = 36 * 4.184 *(20 - 0.0) + 2 * (6.02 * 1000) = 15052.5 J

ΔHvap for CCl2F2 is 289 J/g

mass of CCl2F2 must evaporate = 15052.5 / 289 = 52.1 gm

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