Q.

The work done to  contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process

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a

+590 joules

b

-334 joules

c

+334 joules

d

-590 joules

answer is C.

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Detailed Solution

As the work is done on system, it will be positive i.e. W=+462 joule, q=−128 joule  (heat is evolving) From the 1st law of thermodynamics             ΔE=q+w=(−128)+(+462)=+334 Joules.
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The work done to  contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process