The Normal Freezing Point of Benzene (C₆H₆, 78 $\degree$ C, and Its K_f Value Is 5

Multiple Choice

The normal freezing point of benzene (C₆H₆, 78.12 g/mol) is 5.49 $\degree$ C, and its K_f value is 5.12 $\degree$ C/m.To create a solution with a freezing point of 0.00 $\degree$ C, how many grams of naphthalene (C₁₀H₈, 128.2 g/mol) would need to be dissolved in 640.0 g of benzene?

A) 5.63 g
B) 137 g
C) 82.0 g
D) 187 g
E) 88.0 g