Art - Excellent point. You are completely right in that I should have taken a step back to a more fundamental method, than the one I suggested especially since his problem was posed in standard units.
The reason I suggested he use mdot = rho * qdot is because I personally NEVER get the luxury of working in standard conditions, so by habit I just whupped the first tool out of the toolbox. Every single problem I am faced with in my daily practice requires actual gas properties, and I am used to dealing with gases that are highly non-ideal due to gas polarity or operation at conditions way far away from STP. Thus I am completely spoiled by HYSYS, Pipephase, and SuperFlo. I am so spoiled that I have gotten to the point where I can get an actual gas density (and whatever else) out of HYSYS in about 10 sec. Plus, I am a dumb ME so I forgot everything I learned in CHEM 1135 ;-). I am so used to mdot=rho * qdot that that was the first thing that came to mind.
Good points, all. Pete
By the way since you're from Texas, you will note that I used the proper spelling of 'whupped'. ;-)
Thanks!
Pete