CBSE Class 10 Answered
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Asked by pratikshyadashrkl | 29 Mar, 2020, 22:08: PM
Expert Answer
In the gas mixture , since N2 and He are in equal molar ratio, their partial pressures are alsoequal.
Partial pressure of N2 = 2000 mm of mercury ; Partial pressure of He = 2000 mm of mercury;
As per the given decrease of pressure of N2 with respect to time,
N2 partial pressure will comedown to 500 mm of mercury in 1 hour.
By Graham's law of effusion, Rate of effusion is inversely prportional to square root of molar mass.
Being a lighter molecule, He will effuse 2.646 times faster than N2 .
Hence pressure of He decreases 2.646 times more compare to Nitrogen.
Hence partial pressure of He after 1 hour = 500 /2.646 = 189 mm of mercury
molar ratio of ( N2 /He ) = 500/189 = 2.646 /1
Answered by Thiyagarajan K | 30 Mar, 2020, 14:41: PM
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