At 99ﾟC and 748 Torres, a sample of a volitile liquid is vaporized completely in a...
At 99ﾟC and 748 Torres, a sample of a volitile liquid is vaporized completely in a 250 mL flask. The condensed vapor weighs 1.097 g calculate the molar mass of the gas
Homework Answers
Given:
P = 748.0 torr
= (748.0/760) atm
= 0.9842 atm
V = 250.0 mL
= (250.0/1000) L
= 0.25 L
T = 99.0 oC
= (99.0+273) K
= 372 K
find number of moles using:
P * V = n*R*T
0.9842 atm * 0.25 L = n * 0.08206 atm.L/mol.K * 372 K
n = 8.06*10^-3 mol
mass(solute)= 1.097 g
use:
number of mol = mass / molar mass
8.06*10^-3 mol = (1.097 g)/molar mass
molar mass = 1.361*10^2 g/mol
Answer: 1.36*10^2 g/mol
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