The standard reduction potentials for the following reactions are given below.
Pyruvate + 2H+ + 2e- → lactate E∘ = -0.190 V
NAD+ + 2H+ + 2e- → NADH/H+ E∘ = -0.320V.
Calculate △G∘ for the overall spontaneous reaction making use of the relationship between △E∘ and △G∘.