48. What is the density of laughing gas, dinitrogen monoxide, N.0, at a temperature of 325 K and a pressure of 113.0 kPa? 52. What is the molar mass of a gas if 0.0494 g of the gas occupies a volume of 0.100 L at a temperature 26 C and a pressure of 307 torr? 57. A 36.0-L cylinder of a gas used for calibration of blood gas analyzers in medical laboratories contains 350 g CO., 805 g 0., and 4,880 g Na. At 25 degrees C, what is the pressure in the cylinder in atmospheres? 85. Which of the following gases diffuse more slowly than oxygen? F., Ne, No, C.H., NO, CI, H,S 87. Calculate the relative rate of diffusion of H. (molar mass 2.0 g/mol) compared with H. (molar mass 4.0 g/mol) and the relative rate of diffusion of O. (molar mass 32 g/mol) compared with O.(molar mass 48 g/mol)