CS SOLUTIONS C C CC Solution : Solution is a mixture of two or more non-reacting ure substances in which comosition may be altered within certain limits. There are two tyes of solution. They are : Homogeneous solution Heterogeneous solution HOMOGENEOUS SOLUTIONS : In homogeneous solutions, the comonents are comletely miscible with each other i.e, they are single hase solution. In this case, the comonents of the solution will lose their individuality and, therefore, they cannot be searated by filtration, setting or centrifugal action. HETEROGENEOUS SOLUTION : In heterogeneous solutions, the comonents are not miscible i.e., they are multile hase solutions. The comonents of these mixture can be easily searated through filtration, settling or centrifugal action. Tyes of solution : Deending uon the hysical state of solvent and solute, there are nine tye of solutions. They Number Solute Solvent Examles (S ) (S ) Gas Gas (H + N + O : ir) Liquid Gas Water vaours in air, Mist 3 Solid Gas Smoke 4 Gas Liquid HCl in water, CO in water 5 Liquid Liquid C OH in water, n-hexane in benzene 6 Solid Liquid Sugar in water, urea in water 7 Gas Solid d/h ; t/o ; t/cl ; Ni/H 8 Liquid Solid Hg in Zn, Hg in u 9 Solid Solid lloys Out of these nine solutions, there are the most imortant. They are : (i) Gas in Liquids (ii) Liquid in Liquid, and (iii) Solid in liquid Methods of Exressing Concentration of a Solution Name Symbol Definition Formula Volume ercent C amount of solute resent in ml of sol. Weight % % amount of solute resent in g of sol. Molarity M number of mol of solution resent in one L ( dm 3, cm 3 ) of solution Molality m number of mol of solute resent in one kg solvent w C V w % w w n M V m n W solvent Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS M * Relation between Molarity and Molality : m, [d is density of solution in g/l and M is d MM molar mass of solute]. C Vaour ressures : The ressure exerted by the vaours of a liquid which are in equilibrium with it at a given temerature. log H va T T.33R TT C Vaour ressure of solution containing volatile or non-volatile solute : The vaour ressure of a solution deends uon the nature of the solute i.e., whether it is volatile or not. Case I : When the solute is non-volatile (Lowering in vaour ressure) Raoult s Law : It is stated as, if the solute is non-volatile, then the vaour ressure of the solution is directly roortional to the mole fraction of the solvent, at a given temerature. ssume n and n are the number of solvent and solute in a given solution. For non-volatile solutes : = X is the artial ressure of solvent and is the vaour ressure of ure solvent having mole fraction X s the solute is non-volatile thus total ressure of solution and artial ressure of solvent are same. = X... is the total ressure of solution, n n n, m M solvent Case II : When the solution is volatile Raoult s Law : It is stated as, t a given temerature, for a solution of volatile liquids, the artial vaour ressure of each comonent is directly roortional to their mole fraction. For Volatile solutions : = X and = X (Total vaour ressure of solution) = +, = ( )X + Mole fraction of comonents and in vaour hase is determined as X X Y Y * Ideal solution : Which obey Raoult s law at all concentrations and follow the condition. H mix =, V mix = (for liquid - liquid solution too), S mix >. * Non-ideal solution : Which show ositive or negative derivations from Raoult s law. H mix = +ve; V mix = +ve; b.t is smaller than exected Examles of solutions with ositive deviations : (i) C OH + C 6 H (ii) CH 3 COCH 3 + CS (iii) CCl 4 + CHCl 3 (iv) cetone (CH 3 COCH 3 ) + C OH (v) C OH + H O * Non-ideal solution with negative deviation from Raoult s Law H mix = ve; V mix = ve; b.t is higher than exected. Examlex of solutions with negative deviations : (i) cetone and chloroform (ii) Chloroform and ether (iii) Chloroform and nitric acid (iv) cetone and aniline (v) Water and nitric acid Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS 3 * zeotroe : mixture of liquids boils at a constant temerature like ure liquid and has same comosition of comonent in liquid as well as vaours. ractice roblems :. Two liquids and have vaour ressure in the ratio : = : 3 at a certain temerature. ssume and form an ideal solution and the ratio of mole fraction of to in the vaour hase is : 3, then the mole fraction of in the solution at the same temerature is 3 3. The vaour ressure of solution of 5 g of a non-electrolyte in g of water at a articular temerature is 985 Nm. The vaour ressure of ure water at that temerature is 3 Nm. The molecular mass (g mol ) of the solute is 8 9 7 3. The vaour ressure of a ure liquid is 4 mm Hg at 3 K. The vaour ressure of this liquid in a solution with liquid is 3 mm Hg. Mol fraction of in the solution, if it obeys Raoult s law, is :.8.5..4 4. The vaour ressure of a solvent decreased by mm of Hg when a non-volatile solute was added to the solvent. The more fraction of solute in solution is., what would be the mole fraction of solvent if decreases in vaour ressure is mm of Hg.8.6.4. [nswers : () a () a (3) a (4) b] 4 3 4 C3 C3 Colligative roerties : roerties, whose values deends only on the concentration of solute articles in solution and not on the identity of the solute are called Colligative roerties. Van t Hoff Factor i : There may be change in number of mol of solute due to ionisation or association hence these roerties are also affected. Number of mol of the roduct is related to degree of ionisation or association by van t Hoff Factor i is given by * In case of dissociation : i = [ + (n )] where n is the number of roducts (ions or molecules) obtained er mol of the reactant. * In case of association : i = [ + ( n )] where n is the no. of moles of solute undergoes association and is degree of association i Theoretical molar mass Exerimental molar mass Observed valueof colligative roertydue todiss. or asso. i Theoretical valueof colligativeroerty without diss.or asso. no.of molesof soluteat time't' i initial no.of moles of soluteadded if i = (no change), i > (dissociation), i < (association) Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
ractice roblems : CS 4. Which one of the following salt would have the same value of the Van t Hoff factor (i) as that of K 3 [Fe(CN) 6 ] NaCl Na SO 4 l (SO 4 ) 3 l(no 3 ) 3. The van t Hoff factor of a.5 M aqueous solution of KCl is.96. The degree of dissociation of KCl at the given concentration is 9% 94% 96% 98% [nswers : () d () c] C3C There are four Colligative roerties : (i) Relative lowering in vaour ressure (ii) Elevation in boiling oint (iii) Deression in freezing oint (iv) Osmotic ressure * Colligative roerties are defined for only non-volatile solute. (i) Relative lowering in vaour ressure X solute... [X solute is mole fraction of solute in in n = ( ) is lowering in vaour ressure]... [n and n are no. of moles of solutes and solvent resectively] (ii) Elevation in boiling oint T b = T b T b = ik b.m... In elevation of b.t : b.t of solution (T b ) > (T b ) b.t of solvent [K b is called as molal elevation constant, m is the molality of solution] b ) R(T Msolvent Kb H... [M solvent is molar mass of solvent and H v is the enthaly of va. vaorisation er mole of solvent] (iii) Deression in freezing oint : T f = T f T f = ik f m... [K f is molal deression constant] F.t of solution (T f ) < (T f ) F.t of solvent K f f ) R(T Msolvent... [H H f is the enthaly of fusion er mole of solvent] fus. (iv) Osmotic ressure () Sontaneous flow of solvent from dilute solution (it may be ure solvent) into the concentrated solution through a semi ermeable membrane is called osmosis. ressure required to revent osmosis is called as osmotic ressure. Coer (II) ferrocyanide, Cu [Fe(CN) 6 ], warm mixture of gelatine and glycerine are common semi-ermeable membranes. = icrt... [C is the molarity or the solution at temerature T ] * For isotonic solution = Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS 5 * For a solution > (hyotonic) * < (hyertonic) Reverse osmosis : Flow of solvent of high concentrate solution into low by the alication of ressure, greater than osmotic ressure. (For desalination of sea water). ractice roblems :. The vaour ressure of water at room temerature is lowered by 5% by dissolving a solute in it, then the aroximate molality of solution is 4 3. solution of glucose (C 6 H O 6 ) is isotonic with 4 g of urea (NH CO NH ) er litre of solution. The concentration of glucose is 4 g/l 8 g/l g/l 4 g/l 3.. molal aqueous solution of an electrolyte X 3 Y is 5% ionized. The boiling oint of the solution is (K b for H O =.5 K kg/mol) 375.5 K 374.4 K 377. K 373.5 K 4. Molal deression of freezing oint of water is.86 er g of water.. mole of urea dissolved in g of water will roduce a lowering of temerature of.86.37.86 3.7 5. rrange the following aqueous solutions in the order of their increasing boiling oints (i) 4 M NaCl (ii) 3 M Urea (iii) 3 M MgCl (iv) M NaCl (i) < (ii) < (iv) < (iii) (ii) < (i) = (iii) < (iv) (i) < (ii) < (iii) < (iv) (iv) < (iii) < (i) = (ii) 6. mol each of following solutes are taken in 5 mol water, () NaCl () K SO 4 (C) Na 3 O 4 (D) glucose ssuming % ionisation of the electrolyte relative decrease in vaour ressure will be in the order : < < C < D D < C < < D < < < C equal 7. tcl 4.6H O can exist as a hydrated comlex; molal aq. solution has deression in freezing oint of 3.7. ssume % ionisation and K f (H O) =.86 mol kg, then comlex is : [t(h O) 6 ]Cl 4 [t(h O) 4 Cl ]Cl.H O [t(h O) 3 Cl 3 ]Cl.3H O [t(h O) Cl 4 ].4H O 8. The osmotic ressure of a 5% (wt./vol.) solution of cane sugar at 5 C is 4 atm 3.4 atm 5.78 atm.45 atm 9. Following solutions at the same temerature will be isotonic 3.4 g of cane sugar in one litre water and.8 g of glucose in one litre water 3.4 g of cane sugar in one litre water and.8 g of glucose in. one litre water 3.4 g of cane sugar in one litre water and.585 g of NaCl in one litre water 3.4 g of cane sugar in one litre water and.7 g of NaCl in one litre water. Relative decrease in V.. of an aqueous glucose dilute solution is found to be.8. Hence elevation in boiling oint is : (it is given molal aq. urea solution boils at.54 C at atm. ressure)..8.8.54.3 Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS 6. Two solutions () containing FeCl 3 (aq) and () containing K 4 Fe(CN) 6 are searated by semiermeable membrane as shown below. If FeCl 3 on reaction with K 4 Fe(CN) 6 roduces blue colour of Fe 4 Fe(CN) 6, the blue colour will be noticed in () () In both () and () Neither in () nor in (). g. of solute and g. of solute are both dissolved in 5 ml. of water. The solution has the same osmotic ressure as 6.67 g of and 3 g of are dissolved in the same volume of water at the same temerature. Thus the ratio of molar masses of and is 3.33 3.33 3. t 5 C, the osmotic ressure of human blood due to the ressure of various solutes in the blood is 7.65 atm. ssuming that molarity and molality are almost same. The freezing oint of blood is [K f =.86 K kg/mol]..58 C.58 C.58 C.58 C [nswers : () d () c (3) b (4) b (5) c (6) c (7) c (8) c (9) b () c () d () b] SINGLE CORRECT CHOICE TYE. The mathematical exression of Raoult s law is n N n N N n n N. The freezing oint of equimolal aqueous solutions will be highest for Ca(NO 3 ) C 6 NH 3 Cl (aniline hydrochloride) La(NO 3 ) 3 C 6 H O 6 (glucose) 3.. molar aqueous solution of a weak acid (HX) is ercent ionised. The freezing oint of the solution is (K f for H O =.86 K mol kg)..45 C.9 C.3 C.53 C 4. The exression relating molality (m) and mole fraction of solute (x ) in a solution is x x mm mm mm mm where M is the molar mass of solvent. x x mm mm mm mm 5. For an ideal binary liquid solution with >, which of the following relations between x (mole fraction of in liquid hase) and y (mole fraction in vaour hase) is correctly reresented? x = y x > y x < y x and y cannot be correlated with each other 6..56 gm of sulhur in gm of CS has deression in F.. of., K f =.(molal). Hence atomicity of sulhur in CS is : 4 6 8 Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS 7 7. Relative decrease in vaour ressure of an aqueous solution containing mol [Cu(NH 3 ) 3 Cl] Cl in 3 mol H O in.5. On reaction with gno 3, this solution will form : mol gcl.5 mol gcl mol gcl.4 mol gcl 8. When mercuric iodide is added to the aqueous solution of otassium iodide, the : freezing oint is raised freezing oint is lowered freezing oint does not change boiling oint does not change 9. If a thin slice of sugar beet is laced in concentrated solution of NaCl then Sugar beet will lose water from its cells Sugar beet will absorb water from solution Sugar beet will neither absorb nor lose water Sugar beet will dissolve in solution. Which is not a colligative roerty Lowering of vaour ressure Freezing oint Osmotic ressure Elevation of boiling oint. Osmosis is a sontaneous flow through a semiermeable membrane of less concentrated solution into more concentrated solution The solvent from a solution of lower con centration to one of higher concentration Solute articles from a solution of higher concentration to one of lower concentration None. When the vaour ressures of solutions of two liquids are less than those exected from ideal solutions, they are said to show ositive deviations from ideal behaviour Negative deviations from ideal behaviour ositive deviations for lower concentrations and negative deviations for higher concentration None 3. The ratio of the value of any colligative roerty for KCl solution to that of sugar solution is.5 5 4. Which aqueous solution has minimum freezing oint. M NaCl.5 M C OH.5 M MgI.5 M MgSO 4 5. The molal freezing oint constant of water is.86 K molality. If 34 g of cane sugar (C H O ) are dissolved in g of water, the solution will freeze at.86 C.86 C 3.9 C.4 C 6. The deression in f.t. of. m aqueous solution of urea, sodium chloride and sodium sulhate is in the ratio : : : : 3 : : 4 : : 3 7. Lowering in vaour ressure is the highest for. m Urea. m Glucose. m MgSO 4. m acl 8. solution of one mole of benzoic acid in 5 moles of benzene roduces a relative lowering in vaour ressure of /3. The mol. wt. of benzoic acid is 44 6 89 9. The lot of y versus x (where x and y are the mole fraction of in liquid and vaour hases, resectively) is linear with sloe and intercet resectively are given as /, / /, / /, / /, /. The vaour ressure of a solution of a non-volatile solube in a solvent is 95% of the vaour ressure of the solvent at the same temerature. If the molecular weight of the solvent is.3 times the molecular weight of the solute, what is the ratio of weight of solvent to solute..5 5.7. none of these Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS 8. The freezing oint of aqueous solution that contains 5% by mass urea,.% by mass KCl and % by mass of glucose is 9. K 85.5 K 69.3 K 5 K. 5 ml of an aqueous solution of KCl was found to require ml of M gno 3 solution when titrated using a K CrO 4 as indicator. Deression in freezing oint of KCl solution with % ionisation will be : [K f =. mol kg and molarity = molality] 5. 3..6.8 3. Osmotic ressure of 4% (wt./vol.) urea solution is.64 atm and that of 3.4% (wt./vol.) cane sugar is.46 atm. When equal volumes of the above two solutions are mixed, the osmotic ressure of the resulting solution is.64 atm.46 atm 4. atm.5 atm 4. Dry air was assed successively through a solution of 5 g of a solution in 8 g of water and then through ure water. The loss in weight of solution was.5 g and that of ure solvent.4 g. The molecular weight of the solute is 3.5 3.5 3.5 None 5. The molecular weight of NaCl determined by studying freezing oint deression of its.5% aqueous solution is 3. The aarent degree of dissociation of NaCl is.95.5.6.3 6. One litre of milk weighs.35 kg. The butter fat it contains to the extent of 4% by volume has a density of 875 kg/m 3. The density of the fat-free skimmed milk is ( m 3 = 3 litre). 4 kg/m 3.4 kg/m 3. kg/m 3.45 kg/m 3 7.. m aqueous solution of K 3 [Fe(CN) 6 ] freezes at.6 C. The aarent ercentage of dissociation is (K f for water =.86) 6% 5% 78% 9% 8.. g of CoCl 3. 6NH 3 (mol. wt. = 67) was dissolved in g of H O. The freezing oint of the solution was.9 C. roximately how many moles of solute articles exist in solution for each mole of solute introduced is [K f for H O =.86 C. m ]. 3 6 4 9. 5 er cent aqueous solution by mass of a non-volatile solute boils at.5 C. The molar mass of the solute is [K b =.5 K kg mol ]. 8.4 5 5 3. The vaour ressure of a solution containing mol of liquid and 3 mol of liquid at 6 C is 5 mm. When mol of is further added to the above solution, the vaour ressure decreases to 4 mm Hg at the same temerature.the vaour ressures of the ure liquids and are resectively in mm Hg 49., 733.9 9., 733.9 49., 73.9. c. d 3. a 4. a 5. c 6. d 7. a 8. a 9. a. b data is insufficient NSWERS (SINGLE CORRECT CHOICE TYE. b. b 3. c 4. a 5. a 6. b 7. d 8. b 9. c. b. c. b 3. d 4. a 5. a 6. a 7. c 8. d 9. a 3. a Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS 9 INITIL STE EXERCISE (SUJECTIVE). Find out the osmotic ressure exerted by a solution of. M of electrolyte in ascals at 3K...5 g of a non-volatile organic substance was dissolved in ml of CCl 4 at 3 C. The vaour ressure of the solution was found to be 4.9 torr. Calculate the molar mass of the substance if the vaour ressure of CCl 4 at 3 C is 43 torr and its density is.58 g ml. 3. n aqueous solution of a non-volatile solute boils at.7 C. t what temerature would it freeze? (K b =.5 K kg mol and K f =.88 K kg mol ). 4. cetic acid (CH 3 COOH) associates in benzene to form double molecules..65 g of acetic acid when dissolved in g of benzene raised the boiling oint by.36 C. Calculate the van t Hoff factor and the degree of association of acetic acid in benzene. (K b =.57 K kg mol ). 5. t 3 K, the vaour ressure of an ideal solution containing one mole of and 3 moles of is 55 mm of Hg. t the same temerature, if one mole of is added to this solution, the vaour ressure of the solution increases by mm of Hg. Calculate the V.. of and in their ure state. 6. The vaour ressure of % aqueous solution of an electrolyte XY at 373 K is 755 mm of Hg. Calculate the molecular mass of the solute. Vaour ressure of ure water at 373 K is 76 mm of Hg. 7. The vaour ressures at a certain temerature of two liquids and are 39 mm Hg and 7.5 mm Hg resectively. The molecular weights are M = 7 and M = 87. The liquids are comletely miscible. What is the vaour ressure at the same temerature for a mixture of and in the weight ratio :? 8. solution containing 3 gm of a non-volatile solute in exactly 9 gm water has a vaour of.85 mm of Hg at 5 C. Further 8 gm of water is added to solution, the new vaour ressure becomes.5 mm of Hg at 5 C. Calculate (i) Mol. wt of solute., (ii) Vaour ressure of water at 5 C. 9. Chloroacetic acid has K a =.36 3 M. Calculate the freezing oint of. M solution of this acid. ssume that molarity and molality have identical values. K f (water) =.86 K kg mol.. Two solution containing equal quantities of water, one having.5 mole of sugar and other have. gm of calcium chloride. If both the solutions freezes at the same temerature then calculate the aarent degree of ionization of calcium chloride in the solution.. The vaour ressure of a solution containing.5 mole of sodium sulhate in 45 g of water is 756. mm of Hg at C. What is the aarent degree of ionization of Na SO 4 m the solution? (Vaour ressure of ure water at C is 76 mm of Hg)...5 g benzoic acid (molar mass = ) when dissolved in cm 3 of benzene roduces osmotic ressure of.73 atm at 3 K. enzoic acid is known to form dimer in benzene. Calculate (i) ercentage of benzoic acid in the associated state (ii) the equilibrium constant of the dimerization reaction. 3. Calculate the comosition of the vaour in equilibrium with an ideal solution of ethylbenzene ( =. torr) and methylbenzene e ( = 37. torr) m in which the mole fraction of ethylbenzene in the liquid is.35. Calculate the total vaor ressure of the solution. 4. henol associates in benzene to a certain extent to form a dimer. solution containing 3 kg of henol in. kg of benzene has its freezing oint deressed by.69 K. Calculate the fraction of henol dimerized. K f for benzene = 5. mole kg. 5. The vaour ressure of ure benzene at 5 C is 639.7 mm of Hg and the vaour ressure of a solution of a solute in C 6 H 6 at the same temerature is 63.9 mm of Hg. Calculate molality of solution. 6..5M solution of monobasic acid had a freezing oint of.6 C. Calculate K a for the acid. K f (H O) =.86. Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS FINL STE EXERCISE (SUJECTIVE). To 5 cm 3 of water, 3. 3 kg of acetic acid is added. If 3% of acetic acid is dissociated, what will be the deression in freezing oint? K f and density of water are.86 K kg mol and.997 g cm 3 resectively.. Solution of two liquids X and Y obey Raoult s law. t a certain temerature, it is found that when the total ressure above a given solution is 4 mm Hg, the mole-fraction of X in the vaour is.45 and in the liquid is.65. What are the vaour ressures of the two ure liquids at the given temerature? 3. certain liquid mixture of the liquids and behaving ideally shows a vaour ressure of 7 mm Hg at 5 C for a certain mole fraction X of. For the same mole fraction X for in the mixture the vaour ressure of the mixture is 9 torr at 5 C if the difference between the vaour ressure of the ure liquid i.e. = 4 torr, Calculate X, and. 4. When 3.4 gm of mercuric nitrate Hg(NO 3 ) is dissolved in kg of water, the freezing oint of the solution is found to be.558 C. When.84 g of mercuric chloride HgCl is dissolved in kg of water, the freezing oint of the solution is.744 C k f =.86 mol K kg. Will either of these dissociate into ions in an aqueous solution. 5. g of a monobasic acid when dissolved in g of water lowers the freezing oint by.68 C.. g of the same acid when dissolved and titrated required 5. ml of N/ alkali. Calculate degree of dissociation of the acid. (K f for water is.86). 6. Liquids X and Y form an ideal solutions. The vaour ressures of ure X and Y at C are 3 and mm of Hg resectively. Suose that the vaour, above a solution comosed of mole of X and mole of Y at C is collected and condensed. This condensate is then heated to C and vaour is again condensed to form a liquid. What is the mole-fraction of X in? 7. The molar volume of liquid benzene (density =.877 g ml ) increases by a factor of 75 as it vaourizes at C and that of liquid toluene (density.867 g ml ) increases by a factor of 77 at C. solution of benzene and toluene at C has a vaour ressure of 46. torr. Find the mole fraction of benzene in the vaour above the solution. 8. very small amount of a non volatile solute (that does not dissociate) is dissolved in 56.8 cm 3 of benzene (density.889 g cm 3 ). t room temer ature, vaour ressure of this solution is 98.88 mm Hg while that of benzene is mm Hg. find the molality of this solution. If the freezing temerature of this solution is.73 degree lower than that of benzene, what is the value of molal freezing oint deression constant of benzene? 9. mixture which contains.55 g of camhor and.45 g of an organic solute freezes at 57 C. The solute contains 93.46% of C and 6.54% of H by weight. What is the molecular formula of the comound? (Freezing oint of camhor = 78.4 C and K f = 37.7). g of m aqueous solution of sucrose is cooled and maintained at 3.534 C. Find how much ice will searate out. K f (H O) =.86 K. kg. mol. Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857
CS NSWERS SUJECTIVE (INITIL STE EXERCISE). 7.45 5 a. M = 6.86 g/mol 3..68 C 4..5 5. = 4 mm, = 6 mm 6. 55.8 7. 3.83 mm Hg 8. 67.83, 3.78 9.. C. 75%. 75%. 63.8%, K = 3.56 3. X ethyl benzene =.7, X methyl benzene =.873, = 7.55 torr 4. 73.4% 5..5 6..96 3..3 C. 76.9 mm Hg, 68.57 mm Hg 3. X =.5, = torr and = 6 torr 4. Only Hg(NO 3 ) will dissociate 5..9 6..9 7..73 8..45, 5.7 K molality 9. C H. 35.98 g NSWERS SUJECTIVE (FINL STE EXERCISE) Einstein Classes, Unit No., 3, Vardhman Ring Road laza, Vikas uri Extn., Outer Ring Road New Delhi 8, h. : 936935, 857