Noble gases (Group 18 in the periodic table) have the following volume concentrations in dry air: He,
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(a) A concentration of 5.24 ppm He means 5.24 μL of He per liter of air. Using the ideal gas law in Problem 1-16, find how many moles of He are contained in 5.24 μL at 25.00 C (298.15 K) and 1.000 bar. This number is the molarity of He in the air.
(b) Find the molar concentrations of Ar, Kr, and Xe in air at 25°C and 1 bar.
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