Answer:
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..
