What is the molar mass of a gas which has a mass of 834 mg, a volume of 267 mg, a temperature of 85°C, and a pressure of 995 mm Hg?
Given:
P = 995.0 mm Hg
= (995.0/760) atm
= 1.3092 atm
V = 267.0 mL
= (267.0/1000) L
= 0.267 L
T = 85.0 oC
= (85.0+273) K
= 358 K
find number of moles using:
P * V = n*R*T
1.3092 atm * 0.267 L = n * 0.08206 atm.L/mol.K * 358 K
n = 1.19*10^-2 mol
mass(solute)= 834 mg
= 0.834 g
use:
number of mol = mass / molar mass
1.19*10^-2 mol = (0.834 g)/molar mass
molar mass = 70.09 g/mol
Answer: 70.09 g/mol
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