Chemistry Help Use tabulated electrode potentials to calculate ΔG∘ for the following reaction: 2Na(s)+2H2O(l)→H2(g)+2OH−(aq)+2Na+(aq)?

1 Answer

• Na --> Na+ + e- E = +2.71

  2H2O + 2 e- --> H2 + 2 OH- E = -0.83

  Delta E = 2.71 - 0.83 = 1.88 Volts

  You know the reaction is spontaneous because Ecell is positive.

  Delta Go = - n F Delta E

  Delta Go = - 2mol (96485 J/volt mol) (1.88 V)

  Delta go = -3.62X10^5 J/mol = -326 kJ/mol

  Yes, it is VERY spontaneous.