When a 491-G Sample of an Unknown Compound Is Dissolved in 500

Multiple Choice

When a 49.1-g sample of an unknown compound is dissolved in 500.g of benzene,the freezing point of the resulting solution is 3.77°C.The freezing point of pure benzene is 5.48°C and K_f for benzene is 5.12°C/m.Calculate the molar mass of the unknown compound.

A) 147 g/mol
B) 28.7 g/mol
C) 251 g/mol
D) 588 g/mol
E) 294 g/mol