Calculate the molality of a solution that contains 51.2 g of naphthalene, C10H8, in 500 mL of carbon tetrachloride. The density of CCl4 is 1.60 g/mL.

(a) 0.250 m      (b) 0.500 m        (c) 0.750 m             (d) 0.840 m       (e) 1.69 m