[SOLVED] Ideal gas unit conversions 1. The problem statement, all variables and given/known data The ideal gas constants used in this text are typically mass-based: kJ / (kg*K). It is more useful to have them in units of kJ / (kmol*K). How to convert them using data from this text? 2. Relevant equations 3. The attempt at a solution I'd think that this is a problem in which I'd consult the periodic table to obtain the molecular mass of a given compound, but the P. table is not included. I have steam tables, gas-constant/critical point properties tables, etc. Seems like such a simple question, yet I'm not seeing the path. Can anyone point me in the right direction?