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  • A gas absorbs of heat and expands against the external pressure of <img alt="2" src="https://entrancecorner.oncodecogs.

A gas absorbs 140J of heat and expands against the external pressure of 2 atm from a
volume of 0.5L to 1L. The change in internal energy (in Joule) is

Note = (1 L\: atm = 101.3 J)

(Response should be like 45.8)

Option: 1

241.3


Option: 2

38.7


Option: 3

-38.7


Option: 4

0


Answers (1)

best_answer

 The work done in the irreversible process is

\mathrm{W = -P(V_2-V_1)}

\mathrm{V_1 = 0.5L}

\mathrm{V_2 = 1L}

Putting all the values we get,

W = -2(1-0.5) = -1 L.atm

       = -1^{*}101.3J = -101.3J         Note = (1 L\: atm = 101.3 J)

Also,  \Delta E=q+w

\Delta E=+140J-101.3J

\Delta E=+38.7J

 

Posted by

Sanket Gandhi

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