A balloon contains 2.3 mol of helium at 1.0 atm , initially at 190 ∘C?
What's the initial volume?
What's the volume after the gas cools at constant pressure to 27 ∘C?
How much work does the gas do in this process?
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V = nRT / P = (2.3 mol) x (0.08205746 L atm/K mol) x (190 + 273) K / (1.0 atm) = 87 L
(2.3 mol) x (0.08205746 L atm/K mol) x (25 + 273) K / (1.0 atm) = 57 L
The gas doesn't do any work. Work is done on the gas.