122ch13d

# 122ch13d - 38 13.52 39 13.57 40 13.60 13.61 Calculate the...

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39 13.57)
40 13.60) 13.61) Calculate the VP of H 2 O for various aqueous solutions of nonvolatile solutes. Given the masses of solute and solvent we can find moles and then mole fractions. Then use Raoult’s Law, which gives the VP of a volatile substance above a solution (in this case only the H 2 O since the solute is nonvolatile): P H 2 O = X H 2 O P ° H 2 O P H 2 O / VP of H 2 O (solvent) above soln P ° H 2 O / VP of pure H 2 O (solvent) X H 2 O / mole fraction of H 2 O (solvent) * continued on next page *

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41 13.61) (cont.) Could find ) P H 2 O first ( ) P H 2 O = X solute P ° H 2 O ) and then find P H 2 O ) P H 2 O = P ° H 2 O P H 2 O ˆ P H 2 O = P ° H 2 O ) P H 2 O - longer and messier (do it the way I have it below) a) P ° H 2 O = 187.5 torr at 338 K (65°C) 1 mol C 12 H 22 O 11 ? mol C 12 H 22 O 11 = 22.5 g C 12 H 22 O 11 x ----------------------- = 0.065 7 3 mol C 12 H 22 O 11 342.3 g C 12 H 22 O 11 1 mol H 2 O ? mol H 2 O = 200.0 g H 2 O x ------------------
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122ch13d - 38 13.52 39 13.57 40 13.60 13.61 Calculate the...

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