(a) Choose all of the statements from below which correctly describe issues pert

Question

(a) Choose all of the statements from below which correctly describe issues pertaining to the relationship between the emf of a reaction and its Gibbs free energy change.

(A)The Gibbs free energy change and emf values of a reaction have opposite algebraic signs (+ vs. -).

(B)A Gibbs free energy change involves coulombs of substances whereas an emf involves moles of electrons.

(C)Electron stoichiometry must be used to interconvert a Gibbs free energy change and a reaction emf.

(D)A Gibbs free energy change involves moles of substances whereas an emf involves coulombs of electrons.

(E)Faraday's constant is used to interconvert coulombs of electrons and moles of electrons.

Calculate the standard Gibbs free energy changes at 25 oC for each of the reactions shown below using the Eo values given. Select whether each of these reactions is nonspontaneous, at equilibrium, or spontaneous under standard conditions.

(a) 2 Na+(aq) + 2 Br-(aq) 2 Na(s) + 1 Br2(l) Eo = -3.775 V Go =______ kJ/mol

(b) 2 K+(aq) + 1 Zn(s) 2 K(s) + 1 Zn2+(aq) Eo = -2.162 V Go = ______kJ/mol

(c) 1 F2(g) + 2 Cl-(aq) 2 F-(aq) + 1 Cl2(g) Eo = 1.511 V Go = ______kJ/mol

(d) 2 Cu+(aq) + 2 I-(aq) 2 Cu(s) + 1 I2(s) Eo = -0.015 V Go =________ kJ/mol

Explanation / Answer

A C D E

7.28575*10^5

4.17266*10^5

-2.91623*10^5

2.895

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