Cesium (132.9 amu) melts at 29C and its boiling point is 686C. Cesium is introduced into a cell Knudsen temperature and heated to 500 K. A hole with a diameter of 0.50 mm is opened and then after 100 s, a mass loss of 385 mg is detected. Determine the vapor pressure of liquid cesium at 500 K. Hint: Take the value of P as the vapor pressure.