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So far I've calculated the moles of gas present

T1 = -10 degrees C T2 = 100 degrees C W = 40.0J

W = p (V2 - V1)

40.0J = p (nRT2/p - nRT1/p) substitute V=nRT/p

40.0J = nRT2 - nRT1

40.0J = nR(100 - (-10))

n = 0.0437

Now i have no idea how to calculate the pressure. I know that the pressure is the same at T1 and T2. Any hints would be helpful