Two moles of helium are initially at a temperature of 26.0 ∘C∘C and occupy a volume of 3.40×10−2 m3m3 . The helium first

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Two moles of helium are initially at a temperature of
26.0 ∘C∘C and occupy a volume of
3.40×10−2 m3m3 . The helium first expands at
constant pressure until its volume has doubled. Then it expands
adiabatically until the temperature returns to its initial value.
Assume that the helium can be treated as an ideal gas.