A gas is allowed to expand in a well insulated
container against a constant external pressure
2.5 atm from an initial volume of 2.50 L to a final
volume of 4.50 L. The change in internal energy AU
of the gas in joules will be
(1) 1136.25 J (2) -500 J
(3) -505 J
(4) +505 J
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