Give the balanced cell reaction and determine ℰ° for the galvanic cells based on the following half-reactions. Standard reduction potentials are found in the table. (Use the lowest possible coefficients. Omit states-of-matter in your answer.)
(a)
Cr2O72- + 14 H+ + 6 e− → 2 Cr3+ + 7 H2O
H2O2 + 2 H+ + 2 e− → 2 H2O