First slide

First law of thermodynamics

Question

When heat is added to a system, which of the following is not possible?

Easy

A

internal energy of the system increases
B

work is done by system
C

neither internal energy increases nor work is done by the system
D

internal energy increases & also work is done by the system

Solution

$Q = ΔU + W$
When heat is added to a system, Q is positive
So if W = 0, $∆$ U must be positive
$∆$ U and W both may be positive.

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