First slide

Kinetic theory of ideal gases

Question

Find the change in translational kinetic energy per molecule of the gas if its pressure changes by 0.25 atm (volume of the gas = 1.5 litre).

Easy

A

56.25 J
B

25 J
C

66.5 J
D

75 J

Solution

$\begin{array}{l} {ΔK}_{tr} = \frac{3}{2} (p_{1} - p_{2}) V \\ = \frac{3}{2} \times (0.25 \times 10^{5}) \times (1.5 \times 10^{- 3}) = 56.25 J \end{array}$

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