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

The temperature of 0.158 mol of an ideal gas is held constant at 67.0 degrees Celsius while its volume is reduced to a fraction of 20.0 % of its initial volume. The initial pressure of the gas is 1.19 atm.

What is the change in its internal energy?

2. Relevant equations

[tex] U = \frac{1}{2}nRT [/tex] (Per degrees of Freedom)

3. The attempt at a solution

I tried putting in the values to get U, but it doesn't say how many deggress of Freedom, so I triued using three (Monatomic) But this is wrong. Is there another Formula for the Internal Energy, becasue there are several similar questions, but none seem to be used with thereleveant formulaabove?

So any help/idea will be very greatly appreciated,

TFM

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# Homework Help: Internal Energy of an ideal gas

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