A certain gas takes three times as long to effuse out P as helium. ...

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

W
(1) \( 27 \mathrm{u} \)
(2) \( 36 \mathrm{u} \)
(3) \( 64 \mathrm{u} \)
(4) \( 9 \mathrm{u} \)
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