試題詳解

66. Give the effusion time of 250 mL of methane through a small hole is 48 s. How long will it require for same volume of helium to pass through the same hole? (CH4=16 g/mol； He=4 g/mol)
(A) 12 s
(B) 24 s
(C) 48 s
(D) 96 s
(E) 192 s