15) the standard cell potential (E cell) for the voltaic cell based on the react

Question

15) the standard cell potential (E cell) for the voltaic cell based on the reaction below is ?? (see above picture)

16) the standard cell potential of the reaction below is 0.126 V. the value of deltaG for the reaction is (blank) kJ/mol?

17) a voltaci cell is constructed with two silver silver chloride electrodes, where the half reaction is (equation in image). the concentrations of chloride in the two compartments is 0.0222 M and 2.22 M, respectively. The cell emf is ?

Short Answer Questions
18) At constant temperature and pressure the Gibbs free energy value is a measure of the (blank) of a process.

19) the dependence of cell emf on concentration is expressed in the (blank) equation.

True False Question
20) When the cell potential is negative in a voltaic cell the cell reaction will not proceed spontaneously. True or False?

Multiple Choice
21) what happens to the mass number and the atomic number of an element when it undergoes beta decay? (see above picture)

Table 20.2 Half-reaction Cr3+ (aq) + 3e- Cr(s) Fe2+ (aq) + 2e- Fe(s) Fe3+ (aq) + e- Fe2+ (s) | +0.771 Sn4+ (aq) + 2e- Sn2+ (aq) +0.154 E° (V) 0.74 0.440 15) The standard cell potential (E°cell) for the voltaic cell based on the reaction below is V. 15) Sn2+ (aq) + 2Fe3+ (aq) 2Fe2+ (aq) + Sn4+ (aq) A) -0.46 B) +0.617 C) +1.21 D) +1.39 E) +0.46 16) The standard cell potential (E°cell) of the reaction below is +0.126 V. The value of AG° for the reaction is kJ/mol Pb (s) + 2H+ (aq)-> Pb2+ (aq) + H2 (g) A) +24.3 B) -50.8 C) -12.6 D) +12.6 E) -24.3 17) A voltaic cell is constructed with two silver-silver chloride electrodes, where the half-reaction is17) AgCl (s) + e- Ag (s) + CI- (aq) E= +0.222 V The concentrations of chloride ion in the two compartments are 0.0222 M and 2.22 M, respectively. The cell emf is V. B) 0.118 A) 22.2 C) 0.212 D) 0.00222 E) 0.232 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 18) At constant temperature and pressure the Gibbs free energy value is a measure of the of a process 19) The dependence of cell emf on concentration is expressed in the equation. TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 20) When the cell potential is negative in a voltaic cell the cell reaction will not proceed spontaneously. 20) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 21) What happens to the mass number and the atomic number of an element when it undergoes beta 21) decay? A) The mass number decreases by 4 and the atomic number decreases by 2 B) The mass number does not change and the atomic number decreases by 2. C) Neither the mass number nor the atomic number change D) The mass number increases by 2 and the atomic number increases by 1. E) The mass number does not change and the atomic number increases by 1. 4

Explanation / Answer

15- 2xFe 3+   + 2e- ----> 2Fe2+    Eo = 1.542V

Sn2+ ----> Sn4+ + 2e-      Eo= -.154V

Ecell = 1.388

16- Ecell= 0.126V , n = 2

Now we use the formula
G = -nFEcell

        = - 2 x 96485 x 0.126 = 24314.22 J = 24.314KJ

17-Oxidation: Ag(s) + Cl-(aq) ==> AgCl(s) ....E= -0.222
Reduction: AgCl(s) ==> Ag(s) + Cl-(aq) .......E = 0.222
======================================...
Overall: Ag(s) + Cl-(aq) ==> Ag(s) + Cl-(aq)     Ecell= O

The overall cell reaction is therefore

Ag(s) + Cl-(2.22 M) ==> Ag(s) + Cl-(0.0222 M)

Qcell = [Cl-] product / [Cl-] reactant = 0.0222 / 2.22 = 0.0100

Ag(s) is a solid and does not appear in Q

E cell = Eo cell - 0.059/1 log Q

Ecell= 0 - (0.059 log 0.0100) = 0 - (-0.118) = +0.118 V

18-maximum work

19-E cell = Eo cell - 0.059/1 log Q

20-False

21-A

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