P20. (sec. 11.5) A 0.25 grams sample of a non-electrolyte solute is dissolved in 18 grams of a water. This aqueous solution now freezes at -0.20 oC. What is the molecular weight, in glmol, of this solute? (Kf of Water 1.86 °C/m) c) 25.07 g/mol e) 233.5 g/mol P21. (Sec. 11.5) How many grams of toluene, C7Hs, must be added to 425 grams of liquid benzene, C6H6, in order to drop its freezing point to 4.5 oC? Toluene is a non-electrolyte compound. (Kr of Benzene- 5.1 oC/m) & (F.P. of Benzene- 5.5 oC) a) 7.67 grams b) 1.55 grams c) 24.6 grams d) 14.7 grams e) 9.51 grams