1) show by mathematical equations how one can determine themolar mass of a volat

Question

1) show by mathematical equations how one can determine themolar mass of a volatile liquid by measurement of the pressure,volume, temperature, and mass of the liquid. 2) if 0.80 g of a gas occupies 295 ml at 25C and 680 mmHg of pressure, what is the molar mass of the gas? 1) show by mathematical equations how one can determine themolar mass of a volatile liquid by measurement of the pressure,volume, temperature, and mass of the liquid. 2) if 0.80 g of a gas occupies 295 ml at 25C and 680 mmHg of pressure, what is the molar mass of the gas?

Explanation / Answer

(1) The Equation used PV = (w/M)RT Where P = Vapour pressure            V= Volume            T= Temperature           R = gasconstant = 0.0821 Latm / mol - L           w =mass of the liquid          M = Molarmass (2) Given P = pressure = 680 mm Hg = 680 / 760 atm =0.8947 atm            V= Volume = 295 mL = 0.295 L            T= Temperature = 25 + 273 = 298 K           R = gasconstant = 0.0821 Latm / mol - L           w =mass of the liquid = 0.8 g          M = Molarmass = ? We know PV = nRT                PV = ( w / M ) RT Plug thge values we have M = wRT / PV                                           = 74.1566 g

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