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

The standard cell potential can be calculated by subtracting the standard reduction potential of the anode (or oxidizing agent) from the standard reduction potential of the cathode (or reducing agent). Looking up the standard reduction potentials in a table, we get:
Cr3+(aq) + e- -> Cr2+(aq)    E° = -0.40 V
Sn4+(aq) + 2e- -> Sn2+(aq)  E° = +0.15 V
Therefore, the standard cell potential is:
E°cell = E°cathode - E°anode
= (+0.15 V) - (-0.40 V)
= +0.55 V
Note that the reaction equation must be balanced first and that the identity of the reagents in your figure (SnS1U1P14 or Sn4+, for example) appears to be erroneous.

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