A gas is allowed to expand in a well in...

A gas is allowed to expand in a well insulated container against a constant external pressure of `2.5 atm` from an initial volume of `2.50 L` to a final volume of `4.50 L`. The change in internal energy `Delta U` of the gas in joules will be:

1136.25J

`-500J`

`-505J`

`+505J`

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The correct Answer is:

q= 0 (insulated container) `Delta E= w= - P_("ext") Delta V= -2.5 (4.5- 2.5)= -5L` atm `=- 5 xx 101= -505J`

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