A 20.0 L tank contains helium at a pressure of 100 atm and a temperature of 30 degrees Celsius. A) what is the mass of the helium inside the tank?(HINT: the molar mas of He is 4.0 g/mol B) what would the mass of nitrogen (N2) be under the same conditions?
Use PV = nRT and solve for n = number of mols He. Then n = grams/molar mass. You have n and molar mass, solve for grams.
same process for part B.