Asked by Linda

How much heat is required to vaporize 3.50L of at its normal boiling point?
The following data are given for Carbon Tetrachloride. Normal melting point, -23 Degrees Celsius, normal boiling point, 77 Degrees Celsius; density of liquid, 1.59g/mL; Delta H (FUSION): 3.28 kJ mol^-1; vapor pressure at 25 Degrees Celsius, 110 Torr.

**I don't know how to find the heat of vaporization, though when the boiling point is 77 degrees celsius, I found that the heat of vaporization if 192J/g, allowing the FINAL answer to equal to 1068.48kJ, because I was told to be wrong, can someone please correct me?

Thank you.
Answered by DrBob222
Have you tried using the Clausius-Clapeyron equation to find delta H vap? You have P1 and P2, and T1 and T2. Or is that how you found 192 J/g?
And I don't see a starting point for temperature. If you are to determine total heat required from some T to vaporization, you must have both delta H vap and a starting T.
Answered by DrBob222
I found 32.54 kJ/mol for delta H vap (on the Internet).
Answered by Linda
thank you!!!
Secondly, how is it that you solve this type of question, I have no clue in finding a way to start the problem.

thanks
Answered by DrBob222
Do you have a temperature from which to start? Said another way, are you to determine the total heat from some temperature up to and including the vaporization OR are you to determine only the heat from the vaporization?
Answered by Linda
I am to find how much heat is required to vaporize 3.50L of at its normal boiling point?
such that the normal boiling point: 77 Degrees Celsius

and the following data are provided,
Normal melting point, -23 Degrees Celsius
density of liquid, 1.59g/mL
Delta H (FUSION): 3.28 kJ mol^-1
vapor pressure at 25 Degrees Celsius, 110 Torr

Thanks.


Answered by DrBob222
If you need only the heat required to vaporize it, then most of the data provided is not useful (heat fusion, etc).
First, convert 3.50 L to grams using the density listed.
I looked up the heat of vap on the web and found 32.54 kJ/mol. Change that to J/gram
32.54 kJ/mol x (1 mol/molar mass CCl4) x (1000 J/kJ) = heat vap in J/g.
Now
mass CCl4 x heat vap in J/g = ??
Check my thinking. Check my work.
Answered by Linda
Yes!!!
Thank you very much for guiding through this question!
Answered by ekjhcud vdxiwzy
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