2) A mixture of Ar, N2 and He exert 820mm Hg pressure in a 15 liter vessel at 250C. There are in a iÅ¡ liter vesel at 2sC. There 8.6 grams of Ar and 4.5 grams of N, present. How many grams of He are in the container? 3) How many liters of O, at 38ec, 710 mm Hg, are required to react with 23.8 grams of CJHI,o, 4) An unknown gas with weighing 0.738 grams is sealed in a 500 ml flask at 25°C and exerts 589 to react with 23.8 grams of CH,0 in the following reaction: 1n the following reaction : C,H1206 Ï + 602w" 6co,g, t 6H00 C,H1,06Ï+60,el â 6CO, fel + 6H,0 2 (e) mm Hg pressure. What is the molar mass of the unknown? 5) An effusion experiment is performed where Ne takes 13 seconds to complete the experiment and an unknown takes 23.2 seconds. What is the molar mass of the unknown? 6) A 50 gram sample of lead absorbs 51.2 joules of heat as the temperature rises from 25 C to 33°C. What is the specific heat of lead?