Noble gases (Group 18 in the periodic table) have the follow- ing volume concentrations in dry air: He, 5.24 ppm; Ne, 18.2 ppm; Ar, 0.934 vol%; Kr, 1.14 ppm; Xe, 87 ppb. (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 1-18, nd how many moles of He are contained in 5.24 μL of He at 25.008C (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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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.