2 Na (s) + 2 H2O (ℓ) → 2 NaOH (aq) + H2 (g)

Back to reactions list

 

Stoichiometry

Enter a mass or volume in one of the boxes below. Upon hitting submit, the stoichiometric equivalents will be calculated for the remaining reactants and products. All gases are assumed to be at STP.

Na             Mass: g
H2O            Mass: g
NaOH           Mass: g
H2             Mass: g  or Gas Volume: L
Heat Released: kJ

Enthalpy of Reaction

[2ΔHf(NaOH (aq)) + 1ΔHf(H2 (g))] - [2ΔHf(Na (s)) + 2ΔHf(H2O (ℓ))]
[2(-470.09) + 1(0)] - [2(0) + 2(-285.83)] = -368.52 kJ
-368.52 kJ     (exothermic)

Entropy Change

[2ΔSf(NaOH (aq)) + 1ΔSf(H2 (g))] - [2ΔSf(Na (s)) + 2ΔSf(H2O (ℓ))]
[2(48.25) + 1(130.59)] - [2(51.46) + 2(69.91)] = -15.65 J/K
-15.65 J/K     (decrease in entropy)

Reference(s):

Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; pp 139, 195, 197.

Back to list of reactions