# Problem: Calculate E° values for the following cells. Which reactions are spontaneous as written (under standard conditions)? Balance the equations. Standard reduction potentials are found in Table 17‑1.b. MnO4- (aq) + F - (aq) → F2 (aq) + Mn2+ (aq)

###### FREE Expert Solution

When a balanced reaction is given, identify the anode and the cathode half-reactions by determining the changes in oxidation states of each species based on the given reaction:

Recall:

Lose               Gain
Electron         Electrons
Oxidation       Reduction

cathode → reduction → oxidation number decreases

anode → oxidation → oxidation number increases

For ions: charge of the ion = oxidation number
For neutral atoms/compound: oxidation number = 0

Determine the half-cell potentials (refer to the Standard Reduction Potential Table)

F2 + 2 e- → 2 F-                                                      E°cell = 2.87 V

MnO4- + 8H+ + 5 e- → Mn2+ + 4 H2O                     E°cell = 1.51 V

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###### Problem Details

Calculate E° values for the following cells. Which reactions are spontaneous as written (under standard conditions)? Balance the equations. Standard reduction potentials are found in Table 17‑1.

b. MnO4- (aq) + F (aq) → F2 (aq) + Mn2+ (aq)