Suppose two 200 L tanks are to be filled separately with the gases helium and hydrogen. What mass of each gas is needed to produce a pressure of 135 atm in its respective tank at 24 degrees celsius

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Okay for this one, you need to use PV=nRT P = Pressure in atm. T= Temperature in Kelvin. V= Volume in liters. Solve for n, the number of moles. Once you do, change the number or moles by mutiplying by Helium's atomic weight and Hydrogen's aomic weight, seperately. Then you get mass in grams!