A Sapling Learning A 50/50 blend of engine coolant and water (by volume) is usua

Question

A Sapling Learning A 50/50 blend of engine coolant and water (by volume) is usually used in an automobile's engine cooling system. If your cars cooling system holds 4.70 gallons, what is the boiling point of the solution? Make the following assumptions in your calculation: at normal filling conditions, the densities of engine coolant and water are 1.11 g/mL and 0.998 g/mL respectively. Assume that the engine coolant is pure ethylene glycol (HOCHzCHZOH), which is non-ionizing and non-volatile, and that the pressure remains constant at 1.00 atm. Aso, youll need to look up the boiling-point elevation constant for water, Number Check Answer Next Exit

Explanation / Answer

50/50 by volume

assume 4.7 gal = 17.79 L

V of E.G = 17.79/2 = 8.895 L of EG

V of water = 17.79/2 = 8.895 L of water

BP:

dTb = Kb*m = Kb * mol of S / kg solvent

density of EG = 1.11 g/mL

mass = D*V = 1.1*8.895 *1000 = 9784.5 g of E.G

mol = mass/MW = 9784.5 /62.07 = 157.636 mol

mass of water = 8.895 *0.998 = 8.87721 kg

then

molal = mol/kg = 157.636 /8.87721 = 17.757

dTb = 0.512*17.757 = 9.091584°C

Tb = 100+9.091584 = 109.091584°C

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