The mass of Na(s) produced during an enthalpy change +100 kJ is -469.55Kj/mol.
What is enthalpy?
Enthalpy is the sum of internal energy of the system and the volume and pressure.
For given reaction, ΔH°= 2(ΔHf)NaOH -2(a14)1 - 120
Substituting all value given
-367.5kj =2(ΔH°f) NaOH- 2x-285.8Kj/mol
(ΔH°f)NaOH=-939.1/2 = -469.55Kj/mol
Thus, the mass of Na(s) produced during an enthalpy change +100 kJ is -469.55Kj/mol.
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