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A mixture of Ne and Ar kept in a close...

A mixture of Ne and Ar kept in a closed vessel at 250 K has a total K.E.=3 kJ. The total mass of Ne and Ar is 30 g. Find mass % of Ne in gaseous mixture at 250 K.

A

61.63

B

38.37

C

50

D

28.3

Text Solution

Verified by Experts

The correct Answer is:
D
`K=3/2n_(T)RTrArrn_(T)=(3000xx2)/(3xx250xx8.314)`
`3xx10^(3)=3/2n_(T)xx8.314xx250`
`x/20+(30-x)/40=2/(8.314)`
%Ne=28.3
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