The standard cell potential (E°_cell)for the voltaic cell based on the reaction below is __________ V. 3Sn⁴⁺ (aq)+ 2Cr (s)→ 2Cr³⁺ (aq)+ 3Sn²⁺ (aq) A)+1.94 B)+0.89 C)+2.53 D)-0.59 E)-1.02

Question

Quizplus · Accepted Answer

To determine the standard cell potential (E°cell) for the given reaction, we need to use the standard reduction potentials for the half-reactions involved. 
The half-reactions are: 
Sn4+(aq) + 2e- → Sn2+(aq)      E° = +0.15 V 
Cr3+(aq) + e- → Cr2+(aq)        E° = -0.41 V 
We reverse the second half-reaction and multiply it by 2 to balance the electrons: 
Cr(s) → 2Cr3+(aq) + 6e-     E° = +0.82 V 
Now we add the two half-reactions to get the overall reaction and the standard potential for the cell: 
3Sn4+(aq) + 2Cr(s) → 2Cr3+(aq) + 3Sn2+(aq)         E°cell = +0.15 V + (+0.82 V) = +0.97 V 
Therefore, the standard cell potential for the given reaction is +0.97 V, which is closest to choice B (+0.89 V).

The Standard Cell Potential (E°cell)for the Voltaic Cell Based on the Reaction

The Standard Cell Potential (E°_cell)for the Voltaic Cell Based on the Reaction