# Interacting gases - Thermodynamics question

1. Dec 9, 2011

### bdf92

1. The problem statement, all variables and given/known data

2.0g of helium at an initial temperature of 300K interacts thermally with 8.0g of oxygen at an initial temperature of 600K .

What is the initial thermal energy of each gas?

What is the final thermal energy of each gas?

How much heat energy is transferred, and in which direction?

What is the final temperature?

2. Relevant equations

E=3/2 n R T monatomic
E=5/2 n R T diatomic
Q=mcdT

3. The attempt at a solution

What is the initial thermal energy of each gas? I got 1900, 3100 which was right.

What is the final thermal energy of each gas? I got 3300, 1700 which was wrong. I did [E1+E2/n1+n2]*E1=energy lost by E1. It is wrong though.

How much heat energy is transferred, and in which direction?

What is the final temperature?

I need the second one before I can try these

Thanks!

EDIT: Nevermind, figured it out! What I had to do was set the two energy equations equal to each other at T and set them also equal to a net energy of 5000.

Last edited: Dec 9, 2011