A sample of oxygen gas was found to effuse at a rate equal to two times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.

A) 64

B) 128

C) 8

D) 16

E) 8.0

A sample of oxygen gas was found to effuse at a rate equal to two times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.

A) 64

B) 128

C) 8

D) 16

E) 8.0