please help asap will give brainiest What is the independent variable in an experiment? A) The variable that remains the same th
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This is an incomplete question.
The complete question is:
1,1-dichlorotetrafluoroethane, CF3CCL2F, has a vapor pressure of 228 torr. What mass of 1,1-dichloroethane must be mixed with 100.0 g of 1,1-dichlorotetrafluoroethane to give a solution with vapor pressure 157 torr at 25 degrees celsius?
Answer: 46.9 g of 1,1 dichloroethane must be fixed with 100 g of 1,1 dichlorotetrafluoroethane to give a solution with vapor pressure of 157 torr at
Explanation:
As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.
The formula for relative lowering of vapor pressure will be,
where,
= relative lowering in vapor pressure
i = Van'T Hoff factor = 1 (for non electrolytes)
= mole fraction of solute
=
Given : x g of solute is present in 100 g of solvent
moles of solute (1,1 DICHLOROEHTANE) =
moles of solvent (1,1 DICHLOROTETRAFLUOROEHTANE ) =
Total moles = moles of solute + moles of solvent =
= mole fraction of solute =
Thus 46.9 g of 1,1 dichloroethane must be fixed with 100 g of 1,1 dichlorotetrafluoroethane to give a solution with vapor pressure of 157 torr at