Interpretation: The molar mass of an unknown gas should be calculated if a certain number of moles of this gas passes to a tiny hole in
Concept Introduction: According to Graham’s law of effusion, the rate of effusion of any gas is always inversely proportional to the square root of the mass of gaseous particles. The mathematical expression for this law is:
Answer to Problem 88A
The molar mass of the unknown gas is
Explanation of Solution
Gases can diffuse and effuse due to their high kinetic energy. The rate of effusion of gases is directly proportional to their temperature of it and also depends on the molar mass of the gases.
Molar mass of oxygen gas =
Rate of effusion of unknown gas =
Rate of effusion of oxygen gas =
Thus the molar mass of the unknown gas X must be:
As the time of effusion increases for the same moles, the rate of effusion decreases.
Chapter 14 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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