In a given diffusion apparatus, 150 mL of HBr gas (molar mass =
80.91 g/mol) diffused in 10 min. In the same apparatus and under
same conditions, 223 mL of an unknown gas diffused in 10 min. What
is the molar mass of the unknown gas?
A) 51.2 g/mol
B) 31.8 g/mol
C) 36.6 g/mol
D) 44.2 g/mol
E) 57.1 g/mol