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 moles of substances whereas an emf involves coulombs of electrons. ____A coulomb of particles is more particles than a mole of particles. ____Faraday's constant is not used to interconvert a Gibbs free energy change and a reaction emf. ____A Gibbs free energy change involves coulombs of substances whereas an emf involves 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) 1 Al3+(aq) + 3 Ag(s) 1 Al(s) + 3 Ag+(aq) Eo = -2.459 V Go =________ kJ/mol ____nonspontaneous ____at equilibrium ____spontaneous
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
(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 Gibbs free energy change involves moles of substances whereas an emf involves coulombs of electrons.
____A coulomb of particles is more particles than a mole of particles.
____Faraday's constant is not used to interconvert a Gibbs free energy change and a reaction emf.
____A Gibbs free energy change involves coulombs of substances whereas an emf involves 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) 1 Al3+(aq) + 3 Ag(s) 1 Al(s) + 3 Ag+(aq) | Eo = -2.459 V | Go =________ kJ/mol |
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