At what temperature will the total KE of...

At what temperature will the total `KE` of `0.3 mol` of `He` be the same as the total KE of `0.40 mol` of `Ar` at `400 K`

A

533 K

B

400 K

C

346 K

D

300 K

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The correct Answer is:

A

Total K.E `= (3)/(2) nRT rArr 0.3 xx T_(He) = 0.4 xx 400 rArr T_(He) = (1600)/(3) = 533.33 K`

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