Equations: 1. vrms = √(3RT/M) 2. PV = nRT 3.M = mNA I want to answer part a. I am given T,P, and the density of gas molecules (d). From equation 3. I want to solve for m. m = dV = d(nRT/P) m[NA] = M = d(nRT/P)[NA] = dNRT/P; N = nNA. From equation 1. vrms = √(3RTP/(dNRT)) = √(3P/dN). I get stuck at this part because I dont know the value of N.