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At what temperature will the molar kinet...

At what temperature will the molar kinetic energy of `0.3 mol` of `'He'` be the same as that of `0.4 mol` of argon at `400 K`?

A

`700 K`

B

`500 K`

C

`800 K`

D

`400 K`

Text Solution

Verified by Experts

`KE=(3)/(2)nRT`
`n=1`, for molar kinetic energy
`((3)/(2)xx1xxRxxT)_(Helium)=((3)/(2)xx1xxRxx400)_(Argon)`
`T=400 K`
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