Which of the following redox reactions do you expect to occur spontaneously in t

Question

Which of the following redox reactions do you expect to occur spontaneously in the reverse direction? (Hint: The reactions are occurring under standard conditions (1 M for the aqueous ions).)

please help, I know that A reaction with E?cell greater than zero will not occur spontaneously in the reverse direction. Recall that a reaction will occur spontaneously in the reverse direction when the E?cell of a reaction is less than zero.

```2Al(s)+3Pb2+(aq) ? 2Al3+(aq)+3Pb(s) Fe(s)+Cr3+(aq) ? Fe3+(aq)+Cr(s) 2Cu+(aq)+Co(s) ? 2Cu(s)+Co2+(s) Ca2+(aq)+Zn(s) ? Ca(s)+Zn2+(aq)

Explanation / Answer

The Ecell for the reactions in order are:

E=1.5358V

E=-0.707V

E=0.801

E=-2.1062

For the reverse direction you should change the sign. A reaction greater tha zero will occur spontaneously, so the if you invert the second and forth they will occur spontaneously.

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