Calculate the vapor pressure of water above the solution. The vapor pressure of pure water at this temperature is 0.0313 atm. Assume complete dissociation.

This question is incomplete, the complete question is;

The density of a 0.438 M solution of potassium chromate (K2CrO4) at 298 K is 1.063 g/mL.

Calculate the vapor pressure of water above the solution. The vapor pressure of pure water at this temperature is 0.0313 atm. Assume complete dissociation.

Pvap = atm

Pvap =  0.0306 atm

Explanation:

we know that; 1 L = 1000 mL of the solution

Mass of solution = volume x density

= 1000 x 1.063 = 1063 g

Moles of K2CrO4 = volume x concentration

= 1 x 0.438 = 0.438 mol

Mass of K2CrO4 = moles x molar mass = 0.438 x 194.19 = 85.055 g

Mass of water = 1063 - 85.055 = 977.945 g

Moles of water = mass / molar mass

977.945 / 18.02 = 54.27 mol

K2CrO4 => 2 K+ + Cr2O42-

Moles of ions = 3 x moles of K2CrO4

= 3 x 0.438 = 1.314 mol

Vapor pressure of solution = mole fraction of water x vapor pressure of water

= (54.27 / (54.27 + 1.314)) x 0.0313

= 0.0306 atm

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.