Part B A volume of 18.0 L contains a mixture of 0.250 mole N2, 0.250 mole O₂, and an unknown quantity of He. The temperature of the mixture is 0 °C, and the total pressure is 1.00 atm. How many grams of helium are present in the gas mixture? Express your answer to three significant figures and include the appropriate units. ►View Available Hint(s) μÅ Α mass of He = Value + Units ?

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