Calculate the standard cell emf for galvanic cells with the cell reaction

Question

2H2(g) + O2(g)→2H2O(ℓ)in acidic solution.
Answer in units of V

Answer 1

Look up these potentials.
O2 + 4H^+ + 4e ==> 2H2O
2H2 ==> 4H^+ + 4e
----------------------
Add Eo1(as written) + Eo2(as written)

Answer 2

aer

Answer 3

1.23 V