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..

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).