Solve the problem with complete solutions.
At 298.15 K and 0.5 atm, the density of SO2 is 1.31 g/L. The rate of effusion of SO2 through a porous container is 0.27 L/min. (a) Find the density of an unknown gas that effuses through a porous container at the rate of 0.41 L/min under the same conditions. (b) Find the molar mass of the unknown gas.