3. A 1.07 mg sample of an unknown compound was dissolved in 78.1 mg of camphor (solvent),[freezing point(fp) = 179.5, kf=40/m]. The soln fp was measured to be 176.0. What is the molar mass(g/mol) of the unknown compound?

1. 4x10⁷ b) 1.57x10² c) 3.4x10⁵ d) 7.5x10²