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

question 107

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

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