40. Consider the following two-step process. Heat is allowed to
flow out of an ideal gas at constant volume so that its
pressure drops from PA = 3.1 atm to 1.4 atm. Then the gas
expands at constant pressure, from a volume of 6.8 L to VC
= 15.1 L where the temperature reaches its original value.
a) Calculate the total work done by the gas in the process.
b) Calculate the change in internal energy of the gas in the process.
c) Calculate the total heat flow into or out of the gas. (Heat flow into the gas is positive.)


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