1. The problem statement, all variables and given/known data What is the density of radon gas at 0 degrees C and 1 atmosphere? 2. Relevant equations PV= nRT 0 C = 273 K density = mass/volume g/m^3 3. The attempt at a solution I want density = g/m^3 Below are the units of PV = nRT. I thought that breaking it down would help me to see where the g's and the m^3 are- but so far its just confused me. I have been trying to manipulate PV = nRT so that the units eventually give me g/m^3. I think I got something close, but then realized that all I have to plug in is T and P. This is what I tried: P/R = nT/V Units end up: g/m^3 = 1/m^3 I'm not sure if that works out... Nothing is changing so I can't cancel anything and then set up a proportion equation- What the heck do I do??