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0216.0 pointsWhich of the following is a possible combina-tion of values for ΔHlattice, ΔHhydrationandΔHsolution, respectively, for a salt whose dis-solution is endothermic.1.+550,-480,and + 1030 kJ·mol−1,2.-900,-900,and-1800 kJ·mol−1,3.-450,+400,and-50 kJ·mol−1,4.+640,-620,and + 20 kJ·mol−1,cor-rectExplanation:ΔHsolution= ΔHlattice+ ΔHhydration- theproblem stipulates that ΔHsolutionbe positive
Version 573 – Exam 1 – Laude – (52390)7(endothermic) and this limits the values theother two terms can have.0226.0 pointsRank the following liquids in decreasingorder of solubility in heptane (C7H16): NH3,CH3OH, CH3CH2F, CCl4.1.CH3CH2F>CH3OH>CCl4>NH32.NH3>CH3OH>CH3CH2F>CCl43.CCl4>CH3CH2F>CH3OH>NH3correct0236.0 pointsWhat would be the pOH of a solution ofSr(OH)2(strontium hydroxide) prepared bydissolving 122 g of the base into 10 L of purewater (H2O)?70246.0 pointsWhich of the following gases are more solublein water when their partial pressure above thesolution is increased?HI,SO3,NH3,O2,NO2,HF,Cl20256.0 points
Version 573 – Exam 1 – Laude – (52390)8to the smallest (2×10−11) Ka, one is rankingfrom the most to least acidic.0266.0 pointsAn unknown liquid has a vapor pressure of88 mmHg at 45◦C and 39 mmHg at 25◦C.What is its heat of vaporization?