Determine the Freezing Point of a Solution That Contains 78

Multiple Choice

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C₁₀H₈, molar mass = 128.16 g mol^-1) dissolved in 722 mL of benzene (d = 0.877 g mL^-1) . Pure benzene has a melting point of 5.50 °C and a freezing point depression constant of 4.90 °C m^-1.

A) 4.76 °C
B) 4.17 °C
C) 0.74 °C
D) 1.33 °C
E) 1.68 °C