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Final

properties examples

2 Pages
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Department
Chemistry
Course Code
CAS CH 131
Professor
Andrei Lapets

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10/12/12 FeO  4 Cu   ▯Fe 3+ + Cu  in acidic conditions O = ­8       Cu = +1 Fe = +6 + 2­ ­ 3+ 8H  ++FeO  + 42+ ▯Fe ­  + 4H O2 3Cu   ▯3Cu  + 3e 8H  + FeO  + 3Cu   ▯Fe + 3+ + 4H O + 3Cu 2+ 4 2 Cr(OH)  +3Br   ▯2rO 42 + Br in basic conditions 3+ 6+ ­ 2Cr   ▯2Cr  + 6e 3Br  2 6e  ▯6Br ­ ­ 2­ 2Cr(OH)  + 3OH  ▯2CrO 4  + 4H O2 o 500 g of Di­ethyl ether (74.0 g/mol) is in a flask at 30 C. It’s normal vapor pressure is  0.83 atm above the liquid. If 65.0 g sodium benzoate (NaC H CO  154 g/m6l)5diss2lves  in diethyl ether, what is the vapor pressure of diethyl ether above the solution? P solutionP solvent mole fraction of solvent Mol diethyl ether = 500 g/74 = 6.7 mol Mol sodium benzoate = 65 g/154 = 0.422 mol ***sodium benzoate turns into sodium and benzoate in solution, so moles double! *****Things such as BaCl  will t2iple moles In solution, mol of sodium benzoate = 0.844 mol of ions Mol fraction = 6.7/(6.7+0.844) = 0.89 0.89 * 0.83 atm = 0.74 atm What if 65 g
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