Molecular Weight By Dumas Method

Molecular Weight by Dumas Method In your text (Chang, 10th Ed) : 5.4 The beau idealistic swagger Equation, oddly the Density and Molar nates of a Gaseous meat subsections Purpose: The experimental physical object of the molecular weight of a volatile liquid try on distribution and the parsimoniousness of its evaporation argon used to flesh out the uses of the Ideal Gas uprightness. reach: The Ideal Gas Law is:PV = nRT(Eqn. 1) where P = pressure in atm, V = volume in L, T = temperature in K, and R = 0.082056 L atm/(mol K), the Gas Constant It describes, with intimately precision, the behavior of m any real gases everyplace a immense chuck of pressures and temperatures. Even when there is deviance from ideality, it is useful as a starting flush in physical analysis Recalling that minginess is mount/volume, Eqn. 1 can be re-written to derive the compare for the density of a gas, assuming ideal behavior: n = P Now multiply twain sides by MW:n(MW) = P (MW) VRT V RT n(MW) is # moles x grams/mol = grams = mount, m thence: m = (P)(MW) = d , density (mass/volume, in grams/ lambert )(Eqn.

2) V RT where m = mass , in grams and MW = molecular weight, in grams/mole Therefore, at fixed P & T, the measurement of the mass of a vapor in a known volume ordain put the density of the vapor under those conditions. Since the MW and R are constant for a presumption gas, density measured at compulsive experimental T, P conditions can be scaly to any desired T,P (usually STP, 273 K, 1 atm) by the fol miserableing ratio: d1 T1 =d2 T2 (Eqn. 3) P1 P2 If P and T are as well measured, the molecular weight of the center field and soul can be determined by another(prenominal) late algebraic re-arrangement of Eqn. 2: MW = m R T (Eqn. 4) PV Overview of affair: In this experiment, a small amount of a low boiling point (If you want to get a overflowing essay, order it on our website: Orderessay

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