Problem: Which of the following reactions will occur spontaneously as written?A) Sn4+ (aq) + Fe2+ (aq) → Sn2+ (aq) + Fe (s) B) 3 Fe (s) + 2 Cr3+ (aq) → 2 Cr (s) + 3Fe2+ (aq)C) 3 Fe2+ (aq) → Fe (s) + 2 Fe3+ (aq)D) 3 Sn4+ (aq) + 2 Cr (s) → 2 Cr3+ (aq) + 3 Sn2+ (aq)E) Sn4+ (aq) + Fe3+ (aq) → Sn2+ (aq) + Fe2+ (aq)

FREE Expert Solution

We’re being asked if the given redox reaction occurs spontaneously in the forward direction.

Reaction:      2 Al(s) + 3 Pb2+(aq) → 2 Al3+(aq) + 3 Pb(s)


Recall that the greater the E°cell of a redox reaction, the more likely the reaction will occur (more spontaneous reaction)

E°cell > 0 spontaneous in the forward direction
E°cell < 0 nonspontaneous in the forward direction


We will have to calculate for the cell potential to determine the spontaneity of the redox reaction using the following steps:

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Problem Details


Which of the following reactions will occur spontaneously as written?

A) Sn4+ (aq) + Fe2+ (aq) → Sn2+ (aq) + Fe (s) 

B) 3 Fe (s) + 2 Cr3+ (aq) → 2 Cr (s) + 3Fe2+ (aq)

C) 3 Fe2+ (aq) → Fe (s) + 2 Fe3+ (aq)

D) 3 Sn4+ (aq) + 2 Cr (s) → 2 Cr3+ (aq) + 3 Sn2+ (aq)

E) Sn4+ (aq) + Fe3+ (aq) → Sn2+ (aq) + Fe2+ (aq)

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Cell Potential concept. If you need more Cell Potential practice, you can also practice Cell Potential practice problems.