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Category > Chemistry Posted 15 May 2017 My Price 10.00

UNIT 12 SOLUTIONS / 12.2 PROPERTIES OF SOLUTIONS 12.2 Assignment

UNIT 12 SOLUTIONS / 12.2 PROPERTIES OF SOLUTIONS 12.2 Assignment
How does Automotive Antifreeze Work?
Automobile engines are designed to convert the potential energy in gasoline to mechanical
energy to propel the vehicle. Engines also produce a large amount of heat which must be
removed from the engine. Some of this heat is used to warm the inside of the car, but the rest
must be dissipated. You may recall that an automobile radiator contains water that circulates to
remove excess heat from the engine. Since water freezes in the northern climates in the winter,
this creates a problem for a number of reasons. Water expands when it freezes, breaking the
container it is in, and ice doesn’t flow at all.
Ethylene glycol (C2H6O2) is use in automobile radiators to protect against freezing in the winter,
since it lowers the freezing temperature of water.
1. If 100.0 grams of ethylene glycol are dissolved in 900.0 grams of water, what is the
freezing temperature of the solution formed? Follow these steps: Show all of your
calculations.





Calculate the molar mass of ethylene glycol:


Calculate the number of moles of ethylene glycol in the solution:
 

Calculate the molality of ethylene glycol:


Calculate the freezing point depression using the Kf from the Chemistry B Information
Sheet and the molality that you calculated:


Calculate the freezing point of the solution. 2. Think about the result. Think about the typical mid-winter temperature we experience in
Michigan. Is this concentration of ethylene glycol high enough to use in a car radiator in
the winter? Why or why not? ©Michigan Virtual University Page 1 | 1

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Status NEW Posted 15 May 2017 03:05 AM My Price 10.00

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