Question

at pH 7 md tmp : a. -3138 b, +3138 -3600 d+3600 c0 asole Gas constant R- cal deg mol 26. Free energy change associated with the reaction nmning fom the state, w equilibrium is called: entropy b. actual free mergy change of the rea c, standard free energy change of the reaction d entalpy free energy ot activation 27, Acetic acid dissociates according to the equatice HOAcOAe+1 a. -6,486 b.-3244 c. +366 d+6,800 +6,486 cal mole Calculate the pH of 0.1 M solution of acetic acid (K-475) 2.36 Calculate the pK, of a weak base with Ka value of 3.1 x 10 a.5.511 Its dissociation constant K.-1.75 x 10. Calculate he standard free energy o", for its dissociation at pH-Oand at temperatre 25 oc. 28 b. 2.87 c.2.93d. 3.05 e. 3.36 29. c. 7.87 d. 8.49 e. 9.60 30. Calculate the osmotic pressure of a 10% solution of a protein with mol. wt a. 2.24 atm b. 22.4 atm c. 0.112 atm d0.224 atm e0.0224 atm 31. Calculate the degree of dissociation of a 0.05 M weak acid with K- 5x a. 0.05 b, 0.5 c, 0.01 d.0.8 е.0.02 32. Naturally occurring reaction proceeding in a direction that leads to a minimum energy level, that is, toward equilibrium is called: a third law of thermodynamics b. first law of thermodynamics c. spontaneous reaction d. coupled reaction e. endergonic reactiorn 33. When Keq> 1, the standard free energy is: a.0 b. negative c.pos What is characteristic of the open state ?: a. rates of the reaction in the forward direction and in the reverse direction a b. the concentration of the intermediate remains constant during the process c. there is no net flow of matter and energy in either direction d. the entropy of the system is zero e. there is exchange of matter and energy with the environment. 34.

Answer 1

Ans 28) we know pH =pKa + log [A]-/ [HA]

pKa = 4.75

pH = 4.75 - log 0.1 = 3.75

Ans 32) C. SPONTANEOUS REACTION.

Abs 34) e There is an exchange of energy and matter with the environment.

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