ing um Question 29 of 40 Sapling Learning A 50/50 blend of engine coolant and wa

Question

ing um Question 29 of 40 Sapling Learning A 50/50 blend of engine coolant and water (by volume) is system. If your cars cooling system holds 6.20 galilons, what is the boling point of the sokution? used in an automobile's engine cooling Make the following assumptions in your caloulation: at normal filling conditions, the densities of engine coolant and water are 1.11 gimL and 0.998 g/mL respectively. Assume that the engine coolant is pure ethylene glycol (HOCH CH OH), which is non-ionizing and non-volatle, and that the pressure remains constant at 1.00 atm. Also, you'll need to look up the boilling-point.elevationconstant for water. Number

Explanation / Answer

volume = 6.20 gal

volume of coolant = 3.10 gal

volume of water = 3.10 gal

mass of coolant = 3.10 x 3785.41 x 1.11

                          = 13025.6 g

mass of water = 3.10 x 3785.41 x 0.998

                        = 11711.33 g

moles of coolant = 13025.6 g / 62.07 = 209.85 mol

molality = moles / mass of solvent

            = 209.85 / 11.711

molality = 17.92 m

delta Tb = Kb x m

Tb - 100 = 0.512 x 17.92

Tb = 109.17

boiling point = 109.17 oC

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