2. (5 points) Calculate the fraction of Oz molecules with speeds between 400 m/s and 600 m/s at 100C. 3. (5 points) We have calculated expressions for and 1/2 for a perfect gas. Find a similar expression for 1/4 4. (5 points) The density of Ox(g) as a function of pressure at 273.15 K is shown below: pressure p (atm) density p (g/dm) 0.2500 0.356985 0.5000 0.714154 0.7500 1.071485 1.0000 1.428962 Use the data to calculate the virial coefficients B and B' for oxygen at this temperature. Use six significant figures for the molar mass and the gas constant R to assure an accurate result. 5 (5 nhntri Thu