Which of the following aqueous solutions will have the lowest vapor pressure at 25 degrees celsius? (2 points) 1.0 m fe(no3)31.0 m c6h12o6 1.0 m kno31.0 m cacl2

Solution 1.0 M Fe(NO3)3

Explanation:

-Vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system.

- There is an inverse relation between vapor pressure and the  number of particles in the solution.

- Since the four solutions are of equal concentration, the one with the lowest vapor pressure is that which gives greatest number of particles in its solution.

- Sol (1), produces 4 moles of ions per mole of substance.  Fe(NO3)3 → Fe^3+ + 3 NO3^-

- Sol (2), produces 1 moles of ions per mole of substance because C2H12O6 is a non-electrolyte.

- Sol (3), produces 2 moles of ions per mole of substance.   KNO3 → K^+ + NO3^-

- Sol (4), produces 3 moles of ions per mole of substance.  CaCl2 → Ca^2+ + 2Cl^-

So the substance that has the lowest vapor pressure is Fe(NO3)3..

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