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Response Details:
Under these conditions, Argon behaves as an ideal gas, so the ideal gas law may be used.
First, let's get the R constant, from the back of the book: Table A-1 yields: R = 0.2081 kJ/kg·K
∴ 
But temperature and R are constant, so we can re-write this equality as: 
One equation, one unknown, so we can now solve for P2:
Answer: P2 = 200kPa
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