A gas is allowed to expand in a well insulated container against a constant external pressure of...

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A gas is allowed to expand in a well insulated container against a constant external pressure of \( 2.5 \mathrm{~atm} \) from an initial volume of \( 2.50 \mathrm{~L} \) to a final volume of \( 4.50 \mathrm{~L} \). The change in internal energy \( \Delta U \) of the gas in joule will be :
(A) \( 1136.25 \mathrm{~J} \)
(B) \( -500 \mathrm{~J} \)
(C) \( -505 \mathrm{~J} \)
(D) \( +505 \mathrm{~J} \)
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