Molecular Weight By Dumas Method

Molecular Weight by Dumas Method In your text edition (Chang, tenth Ed) : 5.4 The idealistic gun for hire Equation, especially the Density and mill commode of a Gaseous Substance subsections Purpose: The observational object of the molecular weight of a volatile liquid sample distribution and the parsimoniousness of its desiccation atomic number 18 use to illustrate the uses of the Ideal Gas Law. Background: The Ideal Gas Law is:PV = nRT(Eqn. 1) where P = pressure in standard atmosphere, V = majority 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 every real gases over a immense range of pressures and temperatures. up to now when there is deviation from ideality, it is useful as a head start point in physical analysis Recalling that niggardness is intensity/volume, Eqn. 1 force out be re-written to derive the compare for the tightfistedness of a gas, assuming ideal behavior: n = P Now multiply both sides by MW:n(MW) = P (MW) VRT V RT n(MW) is # moles x grams/mol = grams = stack, m thence: m = (P)(MW) = d , density (mass/volume, in grams/ liter )(Eqn. 2) V RT where m = mass , in grams and MW = molecular weight, in grams/mole Therefore, at furbish up P & T, the measurement of the mass of a vapor in a known volume will put the density of the vapor under those conditions. Since the MW and R are constant for a given gas, density measured at compulsive experimental T, P conditions can be scaled to any sought after 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 also measured, the molecular weight of the heart and soul can be determined by another late algebraical re-arrangement of Eqn. 2: MW = m R T (Eqn. 4) PV Overvie w of affair: In this experiment, a small a! mount of a low simmering point (If you want to get a overflowing essay, beau monde it on our website: BestEssayCheap.com

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