12. Caleulate the pK, of a weak base with Kb value of 3.1 x 10 a. 3.22 x 10\' b.
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12. Caleulate the pK, of a weak base with Kb value of 3.1 x 10 a. 3.22 x 10' b. 8.49 c. 9.67 d. 5.51 e. 7.56 13,Which is he corect expression for caliculating the molaity of water in aqueous solutions? a. 18g/1000g b.1 1000g/l The best of vaporization of water is: a 263 calg b 540 cal / 125 cal/s d. 59 cale e. 263 cal 16.-19. Identify the following from the listing 15. Acid A 16 Base B 17. Conjugate acid of the base D 18. Conjugate base ofthe acid C 19. C D What ionic species would predominate for the solution of ammonia at pHt 11 ? » Da 20. Calculate the OH ion concentration (M) in a solution having the pH value of 4 a. 10 M b. 0.6 x 10 c. 10 1.2x 101 e. 10 The energy which is required to start the reaction to an equilibrium state is named: e. enthalpy The maximum useful work that a reaction could perform at constant 21. c. activation energy a. standard free energy d. entropy b. free energy of the reaction 22. temperature and pressure, and depends on the displacement of the system e. first law of thermodynamics from equilibrium is called: a. free energy b. entropy c. enthalpy d. heat content The measure of the randomness or orderliness of the energy and matter in a system is: a. free energy e. high energy 23. b. entropy c. enthalpy d. standard free energy 24. Glucose-6-phosphate is bydrolyzed by glucose-&6-phosphatase and the free glucose is released. At equilibrium at 25 C and at pH 7 we have (glucose-6-phosphate] -5x10-5M and [glucose-Pi] 99.95 x 10-3 M. Calculate the equilibrium constant Keq' for the reaction of hydrolysis: a. 0.1 b. 199.8 c. 300d. 0.01 e. 168.5Explanation / Answer
13.d
13.c
14.b
21.c
activation energy
22.c
enthalpy
23.d
standard free energy
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