Question

Carbon dioxide, CO2, was shown to effuse through a porous plate at the rate of 0.030 mol/min. the same quantity of an unknown gas, 0.030 moles, is found to effuse through the same porous barrier in 95 seconds. Calculate the molar mass of the unknown gas.

Answer 1

The molar mass of the unknown gas is 69.67 g/mol.

Step-by-step explanation:

CO₂: 44 g/mol

1 mol CO₂ ___________ 44 g

0.03 mol CO₂₂ ________ x

x = 1.32 g CO₂

1.32 g of gas effuse through the plate every minute.

1.32 g gas ____ 60s

y ____ 95 s

y = 2.09 g gas

2.09 g gas ___ 0.030 mol

z ___ 1 mol

z = 69.67 g

The molar mass of the unknown gas is 69.67 g/mol.