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CS = (MW x T x p x 1000000) : (22.4 x 273 x BP) p = Vapor Pressure (mm Hg) T = Temperature (K) BP = Barometric Pressure (mm Hg) 22.4 = Volume (liter) occupied by 1 mole of gas at 0OC (273 K) and 760 mm Hg (use 24.5 at 22OC). If barometric pressure is not 760 mm Hg appropriate correction should also be made |