Using the following data
1. CU3+ + 2e- ---> Cu+ E1= 1.28V
2. CU2+ + e- ---> Cu+ E2= 0.15V
3. Cu2+ + 2e- ----> Cu(s) E3= 0.34V
3. Cu+ + e- ----> Cu (s) E4= 0.52V
calculate the standard reduction potential for the reaction of Cu(III) to Cu(II).
Is it .783 V?