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Q.

A certain gas takes three times as long to effuse out as helium. Its molecular mass will be

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a

27u

b

36u

c

64u

d

9u

answer is C.

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Detailed Solution

r∝1M⇒r2r1=M2M1⇒Vg3tVHet =4M19=4M ⇒ M=36  g/mole
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