1.

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

Answer»

`+ 590` JOULES
`- 334` joules
`+ 334` joules
`- 590` joules

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 `I^(st)` law of THERMODYNAMICS
`DeltaE=q+w=(-128)+(+462)=+334` Joules.


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