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Q.

At what temperature will the totat KE of 0.3 mole of He be the same as the total KE of 0.40 mole of Ar at 400 K?

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a

533 K

b

400 K

c

346 K

d

300 K

answer is A.

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Detailed Solution

KE=32nRT KE∝nT (independent of gas)  (KE)Ar=(KE)He0.4×400=0.3×(T)He (T)He=16003=533K
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At what temperature will the totat KE of 0.3 mole of He be the same as the total KE of 0.40 mole of Ar at 400 K?