First slide

First law of thermodynamics

Question

If the heat of 110 J is added to a gaseous system and change in internal energy is 40 J then the amount of external work done is

Moderate

A

180 J
B

70 J
C

110 J
D

30 J

Solution

$W = Q - Δ U = 110 - 40 = 70 J$ .

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