AP0APCH2Cl2= (0.67)(133 torr) = 89 torrPCH2Br2= (0.33)(11 torr) = 3.6 torrAdd the two together to get the total vaporpressure (Dalton’s Law).Ptotal=PA+PB+· · ·= 89 torr + 3.6 torr = 93 torrYou might want to check to see that youget the same answer no matter what valueyou assume as the equal masses of the twocomponents. As an additional challenge, canyou solve this problem WITHOUT assuminga definite number of grams, by setting themass of each component equal to an algebraicvariable?01510.0 pointsFindthenormalboilingpointof4.9m
lakhani (ral963) – Homework 2 – Sutcliffe – (52440)5CaCl2(aq), assuming it undergoes completedissociation.The boiling point constant ofwater is 0.51 K·kg/mol.Your answer must be within±0.3%Correct answer: 107.497◦C.01710.0 pointsPolyacrylamide is a water-soluble polymerwhose aqueous solution containing 25 g/L de-velops an osmotic pressure of 0.54 torr at25◦C. Find the approximate molecular weightof the polymer sample.What answer gives the expected order ofincreasing osmotic pressure?
lakhani (ral963) – Homework 2 – Sutcliffe – (52440)63.lowest Z3<Z2<Z1 highestcorrect4.lowest Z1<Z2<Z3 highest5.lowest Z2<Z3<Z1 highestExplanation:The osmotic pressure of a liquid increasesas the number of moles of solute particles orions increases. 0.5 mol/L Na2SO4means 0.5mol of SO4ions and 1 mol of Na ions for atotal of 1.5 ions. 0.6 mol/L NaCl means 0.6mol of each Na and Cl ions for a total of 1.2mol of ions. 1.0 mol/L of sugar means 1 molof sugar molecules. Therefore, since Na2SO4has the highest concentration of particles orions, it will have the highest osmotic pressure.