Which of these gases diffuse more quickly than oxygen ?
Correct answer: B. NO
- A. H2S
- B. NO
- C. Cl2
- D. N2O
Explanation
Graham's law states that diffusion rate is inversely proportional to the square root of molar mass. Oxygen has a molar mass of 32 g mol-1, while NO has a molar mass of 30 g mol-1, so NO diffuses slightly faster. The likely error is choosing H2S, whose molar mass is 34 g mol-1 and therefore makes it slightly slower than oxygen.
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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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