CHEM 6C Lecture 3: CHEM 6C Lecture 3 Acid-Base Buffers
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13. The standard molarentropy of lead(II) bromide (PbBr2) is 161 J/mol � K.What is the entropy of 2.45 g of PbBr2?
a. | +1.07 J/K | d. | �161 J/K |
b. | �1.07 J/K | e. | 0 J/K |
c. | +161 J/K |
14. CalculateDS0 for theformation of 1 mol of HI(g) from its elements given thefollowing information:
S0[H2(g)] = 131J/mol?K
S0[I2(s)] = 116J/mol?K
S0[HI(g)] = 206 J/mol?K.
A) 82 J/K B) 165 J/K C)247 J/K D) 329 J/K
15. For which reactionis DSsys >0?
A)CH4(g) + 2 O2(g) ?CO2(g) + 2 H2O(l)
B)NH3(g) + HCl(g) ?NH4Cl(s)
C) 2NH4NO3(s) ? 2 N2(g) + O2(g) + 4H2O(g)
D) HCl(aq) + NaOH(aq)? NaCl(aq) +H2O(l)
16. In a biochemicalreaction, A + B C with ?G= 30 kJ/mol. Which of the followingreactions might be effectively coupled to this reaction so that itbecomes more spontaneous?
I. | C + D are the reactants,and B + E are the products | ?G= -40kJ/mol |
II. | C + D are the reactants,and B + E are the products | ?G= +40kJ/mol |
a. | I only |
b. | II only |
c. | I or II |
d. | Neither I nor II canincrease spontaneity. |
e. | No coupling is required asthe reaction is already spontaneous. |