For the reaction whose reactants and products are:?

Question

reactants: Na (s) H2O (l)


products: NaOH (aq) H2 (g)


calculate the standard free energy change (kJ/mole).

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The answer depends on how you balance the equation.
For this question balance the equation using the smallest ratio of WHOLE numbers.

Answer 1

The balanced reaction is 2Na + 2H2O --> 2NaOH + H2.

Free energy of formation of elements in their standard state is 0, so the free energy change will be:

2 * Gf(NaOH[aq]) - 2 * Gf(H2O[l])

Answer 2

2Na + 2H2O = 2NAOH + H2