Homework Help: Chemistry

Posted by Kay on Sunday, November 6, 2011 at 1:29pm.

CFCs such as CF2Cl2 are refrigerants whose use has been phased out because their destructive effect on Earth's ozone layer. The standard enthalpy of evaporation of CF2Cl2 is 17.4 kJ/mol, compared with change in H(vapor)=41kJ/mol for liquid water. How many grams of liquid CF2Cl2 are needed to cool 130.8g of water from 49.4 to 29.4 Celcius? The specific heat of water is 4.184 J/(g*C)

Chemistry - DrBob222, Sunday, November 6, 2011 at 2:42pm
q needed to cool water is
q = mass water x specific heat water x (Tfinal-Tinitial)

Then 17,400 J/mol x ?mol = q to cool water by 20 C.
Solve for moles CF2Cl2 and convert to grams.

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