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A 5 m^3 tank comtains methane. the initial temperature and pressure are P=1bar T=18 degrees C. calculate the P following the each of the successive steps using the ideal gas law.

(a) 1 m^3 (at standard conditions) is withdrawn isothermally
(b) the tank warms to 40 degrees C
(c) 1.2 m^3 (at standard conditions) is added to the tank. final temperature is 35 degrees C
(d) the tanks cools overnight to 18 degrees C

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