According to kinetic theory, a typical gas molecule in thermal equilibrium at room temperature has a kinetic energy K = 6.00 10-21 J, regardless of mass. Estimate the speed at room temperature of a hydrogen molecule H2 (m = 3.34 10-27 kg) and a xenon atom (m = 2.00 10-25 kg). kB = 1.38 10-23 J/K
Question 2
During the volcanic eruption of Mt. Pelee in 1902, an incredibly hot burning cloud rolled down the mountain and incinerated the town of Saint-Pierre. From the damage done, the temperature in the cloud was estimated at 700C. If the air temperature was 20C and a mole of air is 29 grams, estimate the molecular weight of the gas in the burning cloud that made it heavier than the surrounding air. (As a follow-on, estimate the most probable composition of the cloud. Some typical volcanic gases are H2S, SO2, H2SO4, CO2, NO.)