Pressure change of gas

[kolua]

Homework Statement

A sample containing 3.65 mol of a monatomic ideal gas is heated from 289K to 458K, and the entropy remains constant. If the initial volume of the sample was 0.0980m^2, by what factor did the pressure increase or decrease during this process?

Homework Equations

The Attempt at a Solution

it's isentropic. use the formula to get volume and then substitute it into ideal gas formula? would love some hints please!

 

[TSny]

it's isentropic. use the formula to get volume and then substitute it into ideal gas formula?

That should work. What did you get?

 

[kolua]

That should work. What did you get?

I got 0.316 and the answer is 3.16. thanks, I think I might have made mistake in the decimal.

 

[TSny]

I agree with the answer of 3.16. If you can't find your error, post the details of your work.