- #1

Krushnaraj Pandya

Gold Member

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## Homework Statement

I read the expression E=fRT/2 where E is internal energy of ideal gas and f is degrees of freedom, and ##V_{rms} = \sqrt{\frac{3RT}{M}}## Since internal energy for an ideal gas is purely kinetic (according to KTG) I can write 1/2 mv^2 = fRT/2. Now H2 is a diatomic molecule and has 5 degrees of freedom, yet I see the expression ##V_{rms} = \sqrt{\frac{3RT}{M}}## being used for it instead of ##V_{rms} = \sqrt{\frac{5RT}{M}}## What am I missing?

## Homework Equations

All related to KTG

## The Attempt at a Solution

for conceptual clarity, as mentioned