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Chapter 21: Q21.36 P (page 974)

What does a negative Eocell indicate about a redox reaction? What does it indicate about the reverse reaction?

Short Answer

Expert verified

A negative Eo indicates that the reactions won't happen on their own. The negative Eo cell also implies that redox reactions will occur spontaneously if they are reversed.

Step by step solution

01

Definition redox reaction

Electrons are transferred from one chemical material to another in many chemical processes. The oxidation-reduction or Redox reaction is the name given to these electron transport reactions.

02

Determining indication about a redox reaction and reverse reaction

A negative ECell0 suggests that the reactions will not happen on their own. For redox processes to take place, they require an external electrical source. The negative ECell0cell, on the other hand, shows that redox reactions will occur spontaneously if they are reversed, and the ECell0cell is bigger than 0.

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Most popular questions from this chapter

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The following reactions are used in batteries:

I2H2(g)+O2(g)→2H2O(l)Ecell=1.23VIIPb(s)+PbO2(s)+2H2SO4(aq)→2PbSO4(s)+2H2O(l)Ecell=2.04VIII2Na(l)+FeCl2(s)→2NaCl(s)+Fe(s)Ecell=2.35V

The reaction I is used in fuel cells, II in the automobile lead-acid battery, and III in an experimental high-temperature battery for powering electric vehicles. The aim is to obtain as much work as possible from a cell while keeping its weight to a minimum. (a) In each cell, find the moles of electrons transferred and∆G . (b) Calculate the ratio, in kJ/g, ofwmaxto mass of reactants for each of the cells. Which has the highest ratio, which is the lowest, and why? (Note: For simplicity, ignore the masses of cell components that do not appear in the cell as reactants, including electrode materials, electrolytes, separators, cell casing, wiring, etc.)
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