Chemistry Practice Problems Molality Practice Problems Solution: Fluorocarbons (compounds that contain both carbon ...

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Solution: Fluorocarbons (compounds that contain both carbon and fluorine) were, until recently, used as refrigerants. The compounds listed in the following table are all gases at 25 oC, and their solubilities in water at 25 oC and 1 atm fluorocarbon pressure are given as mass percentages.FluorocarbonSolubility (mass %)CF40.0015CClF30.009CCl2F20.028CHClF20.30For CClF3, calculate the molality of a saturated solution.

Problem
Fluorocarbons (compounds that contain both carbon and fluorine) were, until recently, used as refrigerants. The compounds listed in the following table are all gases at 25 oC, and their solubilities in water at 25 oC and 1 atm fluorocarbon pressure are given as mass percentages.


FluorocarbonSolubility (mass %)
CF40.0015
CClF30.009
CCl2F20.028
CHClF20.30


For CClF3, calculate the molality of a saturated solution.

Solution

We’re being asked to calculate the molality of ClF3 given its solubility in mass percent.

Mass or weight percent (% by mass) is the percentage of a given element or compound within a solution. 

The equation used to calculate for mass percent is shown below:

mass percent = mass componenttotal mass×100


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