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164 solutions

Cell Potential

Q. Calculate the standard free-energy change at 25 °C for the following reaction: Mg(s) + Fe^2+(aq) → Mg^2+(aq) + Fe(s) Express your answer to three significant figures and include the appropriate units.

Solved • Mar 4, 2020

Cell Potential

Q. Calculate the standard cell potential (E°) for the reaction X(s) + Y^+(aq) → X^+(aq) + Y(s) if K = 7.35x10^-3 Express your answer to three significant figures and include the appropriate units.

Solved • Mar 4, 2020

Cell Potential

Q. Tarnish on tin is the compound SnO. A tarnished tin plate is placed in an aluminum pan of boiling water. When enough salt is added so that the solution conducts electricity, the tarnish disappears. Imagine that the two halves of this redox reaction were separated and connected with a wire and a salt bridge. Calculate the standard cell potential given the following standard reduction potentials: Al^3+ + 3e^- → Al; E° = -1.66 V Sn^2+ + 2e^- → Sn; E° = -0.140 V Express your answer to two decimal places and include the appropriate units.

Solved • Mar 4, 2020

Cell Potential

Q. Consider the reaction that occurs after you cut a rest apple and it turns brown: white apple + O2 --> brown apple 2H2O Calculate the Gibbs energy and state the standard potential of the reduction half reaction.

Solved • Mar 27, 2020

Cell Potential

Q. To understand the components and processes of a galvanic cell. A galvanic cell (or voltaic cell) produces electricity using a spontaneous redox reaction, such as the one shown here: Sn(s) + Cu^2+(aq) → Sn^2+(aq) + Cu(s) The components of this reaction are separated by a salt bridge and connected with a wire, forcing the electrons to travel across the wire, creating electricity. The salt bridge is a U-shaped glass tube that is filled with a gel-like substance containing a salt. The salt bridge completes the circuit and allows ion to flow, maintaining electrical neutrality in the solutions. The standard reduction potential for a substance indicates how readily that substance gains electrons relative to other substances at standard conditions. The more positive the reduction potential, the more easily the substance gains electrons. Consider the following: Sn^2+(aq) + 2e^- → Sn(s), E° red = -0.140 V Cu^2+(aq) + 2e^- → Cu(s), E° red = +0.337 V What is the standard potential, E° cell, for this galvanic cell? Use the given standard reduction potentials in your calculations as appropriate. Express your answer to three decimal places and include the appropriate units.

Solved • Mar 4, 2020

Cell Potential

Q. Use the standard free energies of formation in Appendix B to calculate the standard cell potential for the reaction in the hydrogen-oxygen fuel cell: 2H2(g)+O2(g)→2H2O(l) delta G for H2O(l) is -237.2

Solved • Mar 24, 2020

Cell Potential

Q. If the equilibrium constant for a 1 electron redox reaction at 298 K is 7.3x104, calculate for the dG and Ecell

Solved • Jan 5, 2020