# RMS speed of nitrogen molecule

1. Jun 6, 2009

### synchronous

1. The problem statement, all variables and given/known data

Compute the rms speed of a nitrogen molecule of 35.0 celcius.

2. Relevant equations

V(rms) = sqrt((3RT)/M)

3. The attempt at a solution

I plugged in 8.31 for R and 308 K for T and 14.0 g/mol for M. I arrived at a solution of 23.4 m/s but this answer came back as incorrect in online homework. However, I used this value to complete parts b and c to this question and correctly completed them. What gives?

2. Jun 6, 2009

Did you change g to Kg?

3. Jun 6, 2009

### Redbelly98

Staff Emeritus
A couple of questions to ponder:

(a) If 1 mole of nitrogen atoms has a mass of 14.0 g, then a mole of nitrogen molecules has a mass of ____?

(b) If 1 mole of nitrogen molecules has a mass of (insert answer to a here), then a single nitrogen molecule has a mass of ____?

Also, as Dadface said, convert from g to kg.

4. Jun 6, 2009

### synchronous

Nitrogen is a diatomic molecule. Thanks for the reminder...all is well.