Page 6 The following data was obtained in an experiment. Use this values to obta

Question

Page 6 The following data was obtained in an experiment. Use this values to obtain the molar mass of the unknown liquid, Determine the density of the liquid from the volume occupied by the sample and the mass obsained from the analytical balance. From the modified Ideal Gas equation, obtain the MM of the unknown. 1. In an experiment designed to determine the molecular mass of a volatile liquid, the following data was gathered: Mass of fnask/cover/vapor Mass of flask/coverT Vapor temperature Volume of flask 94.737g 265 mL Barometric pressure 758 mmig Use this data to find the molecular mass of the liquid. Use this modified equation to obatain ther molar mass of the liquid: MM = (RTF) . d ; where d is the density. Conversion factors and constants 760 mm Hg = 1 atm K= °C + 273 R- 8.21 x 102 L atm mol 'K

Explanation / Answer

d= mass / volume

Mass of liquid = mass of flask and vapour - mass of flask

=95.771-94.737 = 1.034g

Volume occupied by liquid vapour = 265ml

Therefore d = 1.034/265 = 0.0039g/ cm3 = 3.9g/L

MM =(RT/P)* d

= (8.314*371.5/0.99) * 3.9

= 124.48g/ mol

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