OK, I know there are some science minded people around here and I'm hoping one of you can help me out with the ideal gas law. I know how to set up the problem, for example, PV=nRT, where "R" is the constant, and if I have to solve for "T", it should read T=PV/nR correct? And R is .0821 L-atm/mol-K, correct? I think what's giving me the trouble is the math. I"m not sure if I'm reading "R" correct? Is it supposed to read, R x (L x atm/mol x K)? Or am I looking at this wrong? An example problem giving me trouble... I'm trying to find out how many moles of Nitrogen there are here. I'm given... P=1.20 atm V=20.0 L T=298K I need to solve for "n". And I keep getting the wrong answer. I set it up like this, n=PV/RT, or n=1.20 x 20.0/.0821 x (20.0 x 1.20/1.0 x 298) where I'm using the STP to get the 1.0 for n in the "R", but it's just not working out right!!! Grrrr!!! Like I said, I think I'm doing the math for "R" wrong. Any help or examples would really be appreciated. Hope this makes some sense. =) Thanks.