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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

The correct Answer is:
D
`KE = (3)/(2) nRT`
`n = 1`, for molar kinetic energy
`((3)/(2) xx 1 xx R xx T)_("Helium") = ((3)/(2) xx 1 R xx 400)_("Argon")`
`T = 400 K`
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