Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:
Take note that we need to multiply each ΔH˚f by the stoichiometric coefficient. Solving for ΔH˚f:
Consider the reaction
with the enthalpy of reaction
ΔH°rxn = 321.5 kJ/mol
What is the enthalpy of formation of Na2O(s)?
Express your answer in kilojoules per mole to one decimal place.
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