A sample of oxygen gas (O_2) was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.

A) 288

B) 96

C) 55

D) 4

E) 10.7

A sample of oxygen gas (O_2) was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol.

A) 288

B) 96

C) 55

D) 4

E) 10.7