Wednesday
September 17, 2014

Homework Help: chem-answer check please

Posted by Samantha on Thursday, January 10, 2013 at 4:41pm.

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. What mass of this substance must evaporate to freeze 195 g of water initially at 17C? (The heat of fusion of water is 334 J/g; the specific heat of water is 4.18 J/g-K.)

first i used q=mcdeltat to get the q for going from 17 degrees to 0. then i found q in q=heat fusion times mass

i added those together then i did the total= heat of vap times m so i divided by mass and got 273.356g as my answer. is that correct? I wasnt sure if i had to switch celcius to kelvin? I didnt but are you suppose to? thanks!

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