Determine Enthalpy Change of Reaction between Sodium and Water
To make it easier to deduce which reactions are needed, we can write down the equations that correspond to each enthalpy change first.
1. Combustion of H2(g)
2. Combustion of H2O(l)
Notice water cannot be further oxidised since hydrogen has highest oxidation state of +1.
3. Formation of NaOH(aq)
4. Combution of Na(s)
Next is to draw the energy cycle linking reaction 1 and some of the above-mentioned processes.
Therefore answer to this question is option B.
Topic: Energetics, Physical Chemistry, A Level Chemistry, Singapore
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