# Problem: What is the standard e.m.f. for a voltaic cell based on the reactions: Sn4+ (aq) + 2e– → Sn2+ (aq)    E ̊red = +0.154 V Cr3+ (aq) + 3e–  → Cr (s)          E ̊red = –0.74 V   a) +1.94 V b) +0.89 V c) +2.53 V d) –0.59 V e) –1.02 V

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###### Problem Details

What is the standard e.m.f. for a voltaic cell based on the reactions:

Sn4+ (aq) + 2e → Sn2+ (aq)    E ̊red = +0.154 V

Cr3+ (aq) + 3e  → Cr (s)          E ̊red = –0.74 V

a) +1.94 V

b) +0.89 V

c) +2.53 V

d) –0.59 V

e) –1.02 V

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.

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Based on our data, we think this problem is relevant for Professor Jiang's class at GSU.