A voltaic cell utilizes the following reaction: 2Fe3+ + H2 --> 2Fe2+ + 2H+ what is the emf of this cell under standard conditions? what is the emf for this cell when fe3+= 3.70 M, PH2=.94 atm, Fe2+=1.5*10^-3 M, and the pH in both compartments is 3.90?