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A system 500 j or heat and does work of ...

A system 500 j or heat and does work of 50 j on its sourroundings. Calculate the change in internal energy.

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We are given that
Heat absorbed by the system, q = 500 j
Work done by the system, w = - 50 j
We are to find out the change in internal energy `(Delta U)`.
Then, according to first law of themodynamics, change in internal energy can be calculated as follows :
`Delta U = q + w = 500 + (- 50) = 500 - 50`
`Delta U 450 J`
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