First slide

Gaseous state

Question

The average kinetic energy of an ideal gas per molecule in SI unit at 25°C will be

Moderate

A

$6 .17 \times 10^{- 21} kJ$
B

$6 .17 \times 10^{- 21} J$
C

$6 .17 \times 10^{- 20} J$
D

$6 .17 \times 10^{- 20} kJ$

Solution

$\bar{KE} = \frac{3 RT}{2 N_{0}} = \frac{3 \times 8 .3143 \times 298}{2 \times 6 .02 \times 10^{23}} = 6 .17 \times 10^{- 21} J$

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