# The expression of the average speed of gaseous molecules is

1. A

$\sqrt{3RT/M}$

2. B

$\sqrt{2RT/M}$

3. C

$\sqrt{8RT/\pi M}$

4. D

$\sqrt{8{k}_{\mathrm{B}}T/\pi M}$

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### Solution:

The expression of the average speed of gaseous molecules is $\sqrt{8RT/\pi M}$

Where,

m is the molar mass of the substance, expressed in kilograms

T is the temperature

R is the universal gas constant equal

$\mathrm{\pi }$ Is constant equal to 3.14

As the name implies, average speed is the sum of the speeds of gas molecules.

Hence the correct option is C

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