What Is the Molality of a Solution Prepared by Dissolving

Multiple Choice

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C₄H₁₀O, in 425 g of benzene, C₆H₆?

A) 0.362 m
B) 0.498 m
C) 2.01 m
D) 2.76 m
E) None of these choices is correct.