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**1. Homework Statement**

The atmosphere is composed primarily of nitrogen N2 (78%), and oxygen O2 (21%). Find the rms speed of N2 and O2 at 293K

**2. Homework Equations**

Vrms=[tex]\sqrt{}((3RT)/M)[/tex]

**3. The Attempt at a Solution**

Vrms, O2=[tex]\sqrt{}((3*8.31J*293K)/(32g/mol))[/tex] =15.11m/s

*When I looked at the answer to the book, it was 478 m/s because instead of putting 32g/mol in the denominator, they converted it to 0.032*

Thank you for your time

**kg/mol**. Can somebody explain to me why the authors of my book decided to do that? Is my first answer still correct? Or do I need to convert to kg every time I have to do a RMS problem?Thank you for your time