8. A 2.57 gram sample of argon diffuses through a hole in 10.0 minutes. Under the same conditions of pressure and temperature, an 5.50gram sample of an unknown gas diffuses through. the same opening in 60.0 minutes ( 1.00 hour). What is the molecular mass of the unknown gas? 9. At a certain temperature, the velocity of neon molecules is 0.9610m/s. What is the velocity of sulfur dioxide molecules, SO2, at the same temperature and pressure? 10. What is the actual pressure of a sample of 0.25 moles of Ammonia gas when the temperature is 20 degrees C and the volume is 250ml ? (a=4.170,b=0.03707)