Chem help

jilly12

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I was doing this question and I kept getting 0.51V which I concluded as spontaneous but the answer said -0.51V does anyone know where I went wrong? Cause the book said the half-reaction with the higher standard potential goes as written and the other is reversed. (Sorry I cant show my working out its on my iPad and I'm writing this on my computer). If someone could show me their working out it would really be helpful. Thanks. 1721571269443.png
 

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