NH3 gas and HCl gas from the two flasks,at same temperature and pressure were injected simultaneously through pinholes of similar geometry, attached at the two ends of a 1.0 m long glass tube. At what distance from the ammonia end, the first flash of white fume would be observed?
Correct answer: A. 59.43 cm
- A. 59.43 cm
- B. 52.12 cm
- C. 34.37 cm
- D. 49.23 cm
Explanation
By understanding the GRAHAM'S LAW OF DIFFUSION and it's numerical type questions this Question is very easy to solve. When two cotton plugs soaked in HCl and NH3 solutions are introduced in the open ends of 100 cm long tube simultaneously. HCl molecules travel a distance of 40.5 cm while NH3 molecules cover 59.5 cm in the same duration. They produce dense white fumes of ammonium chloride at the point of junction. Hence,Graham's Law the rate of diffusion or effusion of a gas is inversely proportional to the square root of it's density-molar mass at constant temperature and pressure is proved. This is the following solution:
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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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