(a) Choose all of the statements from below which correctly describe issues pert
ID: 917651 • Letter: #
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.
The Gibbs free energy change and emf values of a reaction have opposite algebraic signs (+ vs. -).
A Gibbs free energy change involves coulombs of substances whereas an emf involves moles of electrons.
The Gibbs free energy change and emf values of a reaction have the same algebraic signs (+ or -).
Electron stoichiometry must be used to interconvert a Gibbs free energy change and a reaction emf.
Faraday's constant is not used to interconvert a Gibbs free energy change and a reaction emf.
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.
nonspontaneousat equilibrium spontaneous
nonspontaneousat equilibrium spontaneous
nonspontaneousat equilibrium spontaneous
nonspontaneousat equilibrium spontaneous
(a) 1 Sn4+(aq) + 2 Na(s) 1 Sn2+(aq) + 2 Na+(aq) Eo = 2.864 V Go = kJ/molExplanation / Answer
The correct statments are :
The Gibbs free energy change and emf values of a reaction have opposite algebraic signs (+ vs. -).
Electron stoichiometry must be used to interconvert a Gibbs free energy change and a reaction emf.
on basis of the equation we can , G = -nFEcell identify the correct statemenst
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2 ) a) G = -nFEcell = - 2 x F x 2.864 V = - 552752 joules sponatneous
b) G = -nFEcell = - 2 x F x -0.637 V= 122941 joules non- sponatneous
c) G = -nFEcell = - 2 x F x 2.099 V= - 405107 joules sponatneous
d)G = -nFEcell = - 2 x F x 0.617 V= - 119081 joules sponatneous
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