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I) will have 1.2 mol of particles becauseNaOH completely dissociates in water.II) will have 1.4 mol of particles becauseKCl completely dissociates in water.III) will have 1.5 mol of particles becauseNa2CO3completely dissociates in water.IV) will have 1 mol of sugar in solutionbecause it is soluble but does not dissociate.The higher the concentration, the greaterthe boiling point elevation, soIV>I>II>III.014(part1of3)10.0pointsConsider the following pressure diagram for abinary liquid containing A and B.
clow (twc432) – Homework #2 – holcombe – (51160)501xA80 torr20 torrIf 7 mol of A and 6 mol of B are mixed,what is the vapor pressure of B?What is the corresponding vapor pressure ofA?2.36 torr3.10 torrcorrect4.47 torr5.80 torrExplanation:010.5420 torr10 torr016(part3of3)10.0pointsWhat is the corresponding total vapor pres-sure?1.47 torrcorrect2.36 torr3.20 torr4.10 torr5.80 torrExplanation:010.5420 torr47 torr01710.0pointsWITHDRAWN01810.0pointsAn unknown liquid has a vapor pressure of88 mmHg at 45◦C and a heat of vaporizationof 32 kJ/mol, what is its vapor pressure at55◦C?
clow (twc432) – Homework #2 – holcombe – (51160)61.156 mmHg2.61 mmHg3.127 mmHgcorrect4.89.4 mmHgExplanation:UsetheClausius-ClapeyronEquation.Here, the only thing we don’t know isP2.lnparenleftbiggP2P1parenrightbigg=ΔHvapRparenleftbigg1T1-1T2parenrightbigglnparenleftbiggPparenrightbiggparenleftbigg1parenrightbigglnP2=32,0008.3101910.0pointsA portion of two volatile liquids are pouredinto an evacuated container, filling the con-tainer halfway. The container is then sealed.After equilibrium is established, the measuredpressure is less than expected (negative devi-ation from Raoult’s Law). What is definitelyTRUE about the mixture?Explanation:Raoult’s Law applies to the vapor pressureof the mixture, so a positive deviation meansthat the vapor pressure is higher than ex-pected for an ideal solution and a negativedeviation a lower vapor pressure.Negativedeviation will occur when the interactionsbetween the different molecules are some-what stronger than the interactions betweenmolecules of the same kind.02010.0pointsTwo aqueous solutions are separated by asemipermeable membrane.Solution A = 0.34 M KClSolution B = 0.64 M KClWhich of the following statements is TRUE?1.K+ions flow from solution B to solutionA.