A gas is allowed to expand in a well insulatedcontainer against a constant external pressure of2.5 atm from an initial volume of 2.50 L to a final<volume of 4.50 L. The change in internal energy ΔUof the gas in joules will be [NEET-2017](1) 1136.25 J (2) -500 J(3) -505 J(4) +505 J. plz answer ASAP
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-505joule
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