Homework 8.49 question

[Shreya Narain 2J]

Oxygen difluoride is a colorless, very poisonous gas that reacts rapidly with water vapor to produce O2, HF, and heat: What is the change in internal energy for the reaction of 1.00 mol OF2.


For this question, I know that and the heat released is 318kJ, how exactly do I find the work? I also know that but what exactly do with that?

[KVu 3G]

You find w using w=-P * delta V which can be derived from the ideal gas equation.

PV=nRT



Substitute for gives you .

New equation is where q is given, R is a constant, T=298K, and =1 mol
Please correct me if I've made any mistakes, hope it helped.

[Aaron Knuteson 3K]

This may be a dumb question, but where is the 298K coming from?

Thanks!

[Joshua Kim 3H]

I believe the 298K comes from assuming that the temperature was at the standard state of usually 25 deg. Celsius making 273+25=298K