336 4 Jump to. erleg-CHEM 1032-Spring18-BALCOM > Activities and Due Dates > HW 1

Question

336 4 Jump to. erleg-CHEM 1032-Spring18-BALCOM > Activities and Due Dates > HW 11 o 2/19/2018 11:00 PM O 763/1002/14/2018 12:49 PM 20 of 25 Sapling Learning A 50/50 blend of engine coolant system. If your cars cooling system holds 5:00 galion and water (by volume) is usually used in an automobile's engine cooling s, what is the boiling point of the solution? Make the folowing assumptions in your calculation: at normal filling conditions, the coolant and water are 1.11 g/mL O ethylene glycol (HOCH CH2OH), which is constant at 1 00 atr. Also, youi need to look up the baling densities of engine engine coolant is pure and non-volatile, and that the pressure remains and 0.998 g/mL respectively. Assume that the for water text Prenous Gore up & View Souson (2) Check Answer ONext

Explanation / Answer

1 gallon = 3.78 L

Volume of water = 2.5*3.78 = 9.45 L

Mass of water = Density*Volume = 0.998*9450 = 9431.1 g = 9.4311 kg

Volume of coolant = 2.5*3.78 = 9.45 L

Mass of coolant = Density*Volume = 1.11*9450 = 10489.5 g

Moles of coolant = 10489.5/62.07 = 169

Molality of solution = Moles/Mass of solvent in kgs = 169/9.4311 = 17.91

So,

Elevation in boiling point = dT = Kb*m = 0.512*17.91 = 9.170C

So,

Boiling point of solution = 107.170C

Hope this helps !

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