use appropriate chemical principles to explain the observation. a. Sodium chloride, NaCl, may be spread on an icy sidewalk in order to melt ice. Equimolar amounts of calcium chloride, CaCl_2, are even more effective. (Explain both observations) b. When 1 mole of sodium chloride, NaCl is dissolved in 1 liter of water, the effect on the freezing point of the resulting solution is greater than when 1 mole of sugar, C_12 H_22 O_17, is dissolved in 1 liter of water. 25.0 grams of a non-electrolyte is dissolved in 400 g of water. If the freezing point of the resulting solution is -11.16 degree C. (Freezing pt depression of water is 1.86 degree/kg water and the boiling pt elevation of water is 0.52 degree/kg water) a. What is the corresponding boiling point of the solution? b. What is the mole mass of the solute (non-electrolyte)?