Question

Sodium chloride (MW 58.5) is often used in road and sidewalk treatment during the winter to prevent ice formation. How many grams of sodium chloride should be added to 0.5 kg of water to lower the freezing point by 3°C? The cryoscopic constant of water is 1.860 deg-kg/mole. Calculate the molality of a of 20% solution of a nonelectrolyte (MW = 300). Assume the density of the solution is 1.0. Please provide the value ofi (van't hoff factor) for each of the following compounds (ANSWER SHOULD BE A WHOLE NUMBER): Glucose: i=

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Answer 1

[i=2 for Nad shong electolyse 1) OT = zc ST=ix G x molality - 3 = 2x 1.86 x molality molality=0.8065 molality = molen = 0.8065 map of solvent (Inks) moles - 0.8065 0-5 moles= 0.40325 map of Nad = molex maler many - 0.40325x 58.5 = 23.59 gramy 2 suppore we have loome of solution Met of solute - 200 gram 2 suppose we have 100gine of solution (20%M /u), man of solute = 20 gramy map of solution - volume x density 100 x = 100 grams map of solvent- 100-20=80 grams of 0.080 kg moles of Adute - may 20 = 0.067 A molar mass 300 molality = 0.067 - 0.8375 3 0.080 Glucose i= 1 Chon-electrolyte) I will not dissociate

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