Multiple choice section is earned only if the correct letter is given on the rig
ID: 588720 • Letter: M
Question
Multiple choice section is earned only if the correct letter is given on the right, regardless of what elhe is circle 1) A Galvanic cell is constructed using a Ag/Ag' half cell and another metal half cell1) the one correct answer for each problem in the space for it on the right side of the paper. Credit Use CAPITAL LETTERS for your answer XX. Under standard conditions, this battery produces 0.94 volts of electricity. What is X? A. Pb B. Cu C. Ca D. Sn 2) 2) What isotope is represented by the symbol fx in the following equation: C. Rn D. 2307 3) 3) What would be an expected G" for the dissociation of a weak base in water? A. -500 k/mol B. +500 kJ.mol C. -20 kJ/mol D. +20 kJ/mol A) 4) The third law of thermodynamics states that: A. the Gibbs free energy change is the maximum work that can be done by a reaction. B. the absolute entropy of a crystalline substance at 0 Kelvin is 0 J/K. C. for any spontaneous process, the entropy of the universe increases. D. energy can be transformed but never created or destroyed. 5) 5) Which element is the most difficult to reduce? A. 12(s) B. Br) C. Cla(g) D. F2(g)Explanation / Answer
1)
Sn2+ + 2 e Sn(s) E0 = 0.13 v
Ag+ + e Ag(s) E0 = +0.7996 v
Ecell = Ecathode - Eanode
0.93 = 0.8 - (-0.13)
answer: D
2) answer: B
3) let us take NH3. Kb of NH3 = 1.8*10^-5
dg0 = - RTlnKb
= - 8.314*10^-3*273.15ln(1.8*10^-5)
= 24.8 kj/mol
answer: D
4) answer: B
5) which is having lowest reduction potential,
F2(g) + 2 e 2 F E0 = +2.87 v
Cl2(g) + 2 e 2 Cl E0 = +1.36 v
Br2(l) + 2 e 2 Br E0 = +1.066 v
I2(s) + 2 e 2 I E0 = +0.54 v
answer: A
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