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But I'm stuck on a very simple question related to isobaric (constant pressure) processes for ideal gases.

1)

**Statement of the Problem:**

"A gas undergoes the process shown in the figure. By what factor does the temperature change? "

http://session.masteringphysics.com/problemAsset/1070958/3/16.Q10.jpg

"T(f)/T(i) = ?"

2)

**Relevant equations:**

V(i)/T(i) = V(f)/T(f) (Charle's Law, for isobaric processes)

pv = nRT

3)

**Attempt at solution:**

This should be very simple: T(f)/T(i) = V(f)/V(i), assuming moles stay the same. I just applied the ideal gas law, eliminated the constants (p, n, R).

At constant pressure: V(f)/T(f) = V(i)/T(i), then I solved for the V-terms to get:

T(f)/T(i) =

**V(f)/V(i)**

But mastering physics says "answer does not depend on variable V(f) or V(i)" and evaluates those variables to random number values.

Did I do something wrong, or is this a formatting problem with mastering? Its gotta be something very simple, so I will update with a solution if my prof gets back to me.

Thanks for any help!