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 Δ U of the gas in joules will be

Question

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 Δ U of the gas in joules will be, – 500 J, – 505 J, + 505 J, 1136.25 J

MARKS App · Accepted Answer

As q = 0 so using I law of Thermodynamics. Δ U = - p . Δ V = - 2.5 ( 4.5 - 2.5 ) = - 5 lit atm = - 5 × 101.3 = - 506.5 Joule = - 505 J

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