An unknown gas diffuses 5 times slower than that of H2. The molecular mass of the unknown gas is:
Correct answer: A. 50
- A. 50
- B. 10
- C. 15
- D. 25
Explanation
According to Graham's law of diffusion of gases, the rate of diffusion is inversely proportional to the square root of molar masses of gases. Using the formula r1/r2 =√M1/M2 (5rH2/r2)2 =(√M2/2)2 25×2=M2 M2=50
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About Kinetic Molecular Theory
Kinetic molecular theory explains gases as rapidly moving particles separated by large distances, with negligible volume and negligible intermolecular attraction in the ideal model. It relates temperature to average kinetic energy and explains gas pressure, Boyle's and Charles's laws, diffusion, effusion and the conditions under which real gases deviate from ideal behavior.
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