First slide

Change in internal energy

Question

The internal energy of gases He, O2 and NH3 are plotted against the absolute temperature. The respective graphs 1, 2 and 3 are of

Easy

A

$He, O_{2} and {NH}_{3}$
B

${NH}_{3}, H_{2} and O_{2}$
C

${NH}_{3}, O_{2} and He$
D

$O_{2}, He and {NH}_{3}$

Solution

The internal energy $U = \frac{f}{2} RT and f_{{NH}_{3}} > f_{O_{2}} > f_{He}$ where f is degrees of freedom

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