11. The vapor pressure of a solution containing a nonvolatile solute is: a) alwa

Question

11. The vapor pressure of a solution containing a nonvolatile solute is: a) always less than that of the pure solvent b) always more than that of the pure solvent c) always equal to that of the pure solvent d) less than that of the pure solvent only if the solution process is exothermic e) less than that of the pure solvent only if the solution process is endothermic 12. What is the overall order for the following reaction and rate law? 2A + 3B + C products rate-IA][Brlq a) first b) second c) third d) fourth e) sixth 13. What is the vapor pressure (torr) of an aqueous sucrose (CHz0, molar mass 342.30 g) solution at 20°C that contains 200.0 g sucrose dissolved in 350.0 g water? (vapor pressure of pure water is 17.5 torr at 20PC) a) 0.51 b) 16.0 c 17.0 d)18.0 e) 19.4 14. Which of the following aqueous solutions would have the lowest vapor pressure? a)0.10 nNaci b) 0.15mNaNO, c)0.10mCach d) 0.10 m, Feci) e) 0.10", ??? 15. The units of the rate constant, A, for a third order reaction are: 16. What is the vapor pressure (torr) of an ideal solution containing 0.300 mol methanol (CH,OH) and 0.700 mol water at 5°C? (vapor pressure methanol -40.0 torr at S° C and vapor pressure water -6.54 torr at s c) a) 4.582 b) 16.58 c) 12.00 d)6.541 e)46.54 17. Dissolving a nonvolatile solute such as NaCl in water results in: a) an increase in the vapor pressure of the solution b) a decrease in the boiling point temperature of the solution c) a decrease in the vapor pressure of the solution d) an increase in the freezing point temperature of the solution e) no change in the boiling point temperature of the solution 18. What is the order with respect to a reactant if a doubling of its concentration results in the rate increasing by a factor of 8? a) first b) second c) third d) fourth e) eighth 1.8 X 10s at 20 C. What is the half-life of this reaction if the initial H:0, concentration is 0.30 Mr a) 130,000 s b) 56,000 s c) 17,000 s d) 12,000 s e) 38,000 s 19. The decomposition of hydrogen peroxide (H:O) is a simple first order reaction with a rate coastant of

Explanation / Answer

Ans 11. As in a pure solvent , there are only solvent molecules at the surface and no. of escaping molecules of solvent from the surface of liquid to space are more .

But a solution contains both liquid molecules and non volatile solute molecules , so , no. of solvent molecules are decreased at the surface and no. of escaping molecules of solvent from surface of liquid to space are less .

Therefore , vapour pressure of solution containg a non volatile solute is always less than that a pure solvent .

Answer is a) .

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