Automotive antifreeze consists of ethylene glycol(C_2H_6O_2), a non-volatile a n

Question

Automotive antifreeze consists of ethylene glycol(C_2H_6O_2), a non-volatile a non-electrolyte substance. Calculate the boiling point and the freezing point of a 45% mass % solution of ethylene glycol in water. Boiling point elevation for water (K_b = 0.51 degree C/m)a and freezing point depression of water(k_f) would be 1.86 C/mn Which of the following solute will produce would the largest increase in boiling upon addition to 1kg of water. 1 mol of Ca(NO_3)_2, 2mol of NaCl, 3 mol of C_6H_12O_6. Explain your reason. A solution contains equal mass of glycerol(C_3H_8O_3) and water has a density of 1.15g/ml. calculate the molarity of Glycerol in the solution.

Explanation / Answer

Q18

find Bp given

45% by mass soln of EG in water

assume a basis of 1000 g , so 450 g is EG , 550 g is water

mol of E G= mass/MW = 450/ 62.07 = 7.2498 mol of EG

kg of H2O = mass/MW = 0.55 kg

molality = 7.2498 /0.55 = 13.181 molal

dTb = Kb * m

dTb = 0.51*13.181 = 6.72231 °C --> 106.72 °C

dTf = -Kf*m = -1.86*13.181 = -24.516 °C

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