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10 Gases Solutions to Exercises (b) 1.8 X 1m³ 10⁻⁶ g Hg X 200.6 1 mol Hg X 6.022 X 1 mol Hg Hg atoms = 5.4 X 10¹⁵ Hg atoms/m³ (c) 1600 km³ X 1000³ 1 km³ 3 X 1.8 X 1m³ 10⁻⁶ Hg = 2.9 X 10⁶ g Hg/day Further Applications of the Ideal-Gas Equation (section 10.5) 10.49 Cl₂(g) is the most dense at 1.00 atm and 298 K. Gas density is directly proportional to molar mass and pressure, and inversely proportional to temperature (Equation [10.10]). For gas samples at the same conditions, molar mass determines density. Of the three gases listed, has the largest molar mass. 10.50