bashar95 bashar95

17-07-2020
Chemistry

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A sample of an unknown liquid is vaporized in a flask having a volume of 298 mL at 100.0°C. The vapor has a mass = 0.687 g, and exerts a pressure = 775 torr. Calculate the molecular weight of the unknown liquid.

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nobleswift nobleswift

17-07-2020

Answer:

69.196

Explanation:

using ideal gas equation

PV= nRT
n= mass/molar mass
PV=mass/molar mass x RT
R = 62.364LTorrmol-¹k-¹
make molar mass subject of formula
m.m=(massxRT)/PV
m.m = (0.687 x 62.364 x373)/(775 x 0.298)
m = 69.196

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