Which of the following is true? a) A galvanic cell that has a measured potential

Question

Which of the following is true? a) A galvanic cell that has a measured potential that is positive, means that the reaction is spontaneous and has a negative Gibbs free energy change. b) A galvanic cell that has a measured potential that is negative, means that the reaction is spontaneous and has a negative Gibbs free energy change. c) A galvanic cell that has a measured potential that is positive, means that the reaction is spontaneous and has a positive Gibbs free energy change. d) A galvanic cell that has a measured potential that is positive, means that the reaction is nonspontaneous and has a negative Gibbs free energy change. The K_sp for lead (II) bromide is 7.9 times 10^-5. What is the molar solubility of lead (II) bromide? a) 0.0044 M. b) 0.027 M. c) 0.034 M. d) 0.043 M.

Explanation / Answer

6.

Correct answer is [A]

A galvanic cell involves redox reaction.To see weather a given redox reaction is feasible or not , the emf or cell potential based upon the given redox reaction is calculated

.For the redox reaction to be spontaneous,the emf of the cell must be positive.If the emf comes out to be negative, the direct reaction as given, cannot take place; the reverse reaction may take place.

Also, the electrical work done by the system (cell) results in the corresponding decrease in the free energy of the system.(Acoording to first law of thermodynamics,

Electrical work done=Decrease in free energy)

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