First slide

First law of thermo dynamics

Question

A system absorbs 200 J of heat and 700 J of work is done by the system. Change in internal energy for the process is

Easy

Solution

Heat absorbed by system = +ve
Work done on the surrounding
(or)
Work done by the system = -ve
$ΔU = (+ 200 - 700) J$
$ΔU = - 500 J$

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