# Finding molecular weight from specific heat at constant volume

1. Jan 17, 2010

### TheTourist

The specific heat at constant volume of an unknown solid is measured at high temperature to be 319.5Jkg-1K-1. Estimate its molecular weight.

Cv=3R

Attempt.
I used the above equation to get a mass of the solid to be 0.0128kg but I have no idea of what to do next!

2. Jan 18, 2010

### Mapes

How did you calculate this? (Please include your units.)