## Search found 2 matches

Sun Jan 25, 2015 3:02 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework problem 7.95
Replies: 1
Views: 378

### Homework problem 7.95

In this problem, the enthalpy of vaporization of iodine given is 41.96 kJ/mol at its boiling point, which is given as 184.3 degrees C. To solve for the enthalpy of fusion of iodine at 25 degrees C, you have to change the enthalpy of vaporization given so that they are all at the same temperature of ...
Wed Jan 14, 2015 10:07 pm
Forum: Phase Changes & Related Calculations
Topic: How to know when q is negative (7.11 from the Textbook)
Replies: 2
Views: 2120

### Re: How to know when q is negative (7.11 from the Textbook)

Just a tip for you: I think it helps to always remember that q regards to the heat of the system you are focused on. The question is phrased to seem like heat is gained, but since it is the surroundings that gained heat, the system is actually losing heat. Another thing that can reveal losing heat i...