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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 ΔU of the gas in joules will be:
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 ΔU of the gas in joules will be:
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Solution
The correct option is C −505 J
ΔU=q+w
For adiabatic process, q = 0
∴ΔU=w
=−P.ΔV
=−2.5 atm ×(4.5−2.5)L
=−2.5×2 Latm
=−5×101.3J
=−506.5 J
≈−505 J
ΔU=q+w
For adiabatic process, q = 0
∴ΔU=w
=−P.ΔV
=−2.5 atm ×(4.5−2.5)L
=−2.5×2 Latm
=−5×101.3J
=−506.5 J
≈−505 J
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