Properties of solutions-colligative properties

Question

Assignment:

Properties of Solutions

Q1. Anthraquinone contains only carbon, hydrogen and oxygen and has an empirical formula of C₇H₄O. The freezing point of camphor is lowered by 22.3^oC when 1.32 g of antraquinone is dissolved in 11.4 g of camphor. Determine the molecular formula of anthraquinone. ( Kf for camphor is 40.0).

Q2. A solution is prepared by mixing 25 ml of C₅H₁₂ ( density = 0.63 g/ml) and 45 ml of C₆H₁₄ ( density = 0.66 g/ml). Assume that the volumes add on mixing, calculate for C₅H₁₂
a) mass %
b) mole fraction
c) molality
d) molaroty.