When a 184-G Sample of an Unknown Compound Is Dissolved in 522

question 30

Multiple Choice

When a 18.4-g sample of an unknown compound is dissolved in 522.0 g of benzene, the freezing point of the resulting solution of 3.82°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) 9.20  10³ g/mol
• B) 4.72  10¹ g/mol
• C) 8.85  10² g/mol
• D) 2.96  10¹ g/mol
• E) 1.09  10² g/mol