Thermodynamics isobaric question

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A sample of ideal gas at constant pressure is heated from -10 degrees C to 100 degrees C. The gas does 40.0J of work during this process. How many moles of gas are present? What is the pressure of the gas at 100 degrees C?

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 :smile:
 

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