Ima Chemist Found the Density of Freon-11 (CFCl₃) to Be

Multiple Choice

Ima Chemist found the density of Freon-11 (CFCl₃) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?

A) 96.7 g/mol
B) 108 g/mol
C) 127 g/mol
D) 165 g/mol
E) 175 g/mol