# The Molar Specific Heat (internal energy)

1. Sep 4, 2009

### rey242

1. The problem statement, all variables and given/known data
One mole of an ideal diatomic gas undergoes a transition from. a to c along the diagonal path
What is the change in internal energy?

2. Relevant equations

3. The attempt at a solution

I've tried to use the two other paths since the internal energy is the same both ways, but I cant see anyway to reconcile the two.

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2. Sep 4, 2009

### Redbelly98

Staff Emeritus
What is the equation for internal energy of an ideal gas, in terms of its temperature?

3. Sep 4, 2009

### rey242

$$\Delta$$U=n*Cv*$$\Delta$$T

4. Sep 4, 2009

### Redbelly98

Staff Emeritus
You can use that equation to solve this problem. You just need:

1. the temperature change between points a and c
2. Cv
3. n

5. Sep 4, 2009

### rey242

I figured it out... but now I need to find the work done and the total heat entered into the system. I know it has to do with
U=Q-W

and the use of the other path(ABC).

6. Sep 4, 2009

### Redbelly98

Staff Emeritus
Yes, you'll need that equation (U=Q-W). You can also use the fact that W is the area under the curve in the P-V diagram.