correct number of significare fi flask weighs 124 602 g After vaporization of a

Question

correct number of significare fi flask weighs 124 602 g After vaporization of a sample of volatile laquid experimental write-up, at a measured temperature of C. the flask is sealed, cooled temperature, and weighed. The mass is now 125.225 g The measured P is 7627 torr The fia k is rinsed and filled completely with water at 218 C The mass of the mask is now 37s 176 1. Calculate the volume of the flask from the mass of water contained in the flask and the density 2. Calculate the molar mass of the volatile liquid

Explanation / Answer

mass of Empty bottle = 124.602 g
mass of the non volatile liquid = 125.225 - 124.602 = 0.623g
mass of water = 378.176 - 125.225 = 152.951 g
density of the water is 0.9978 g/mL at 21.8 degrre C
so volume of the water of flask = 152.951/0.9987 = 153.15 mL
density = 0.623 / 153.15 = 4.0679 g/L
PV = nRT
762.7/760 * 153.15/1000 = n * 0.0821 * (21.8+273)
n = 0.00635 moles
n = mass/molar mass
molar mass = 0.623/0.00635 = 98.11 g/mol

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