Problem: Consider the reactionNa2CO3(s)→Na2O(s)+CO2(g)with the enthalpy of reactionΔH°rxn = 321.5 kJ/molWhat is the enthalpy of formation of Na2O(s)?Express your answer in kilojoules per mole to one decimal place.

FREE Expert Solution

Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:

H°rxn=H°f,products-H°f,reactants
   

Take note that we need to multiply each ΔH˚by the stoichiometric coefficient. Solving for ΔH˚f:

H°f,Na2O=H°rxn-(H°f,Na2CO3+H°f,CO2)

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Problem Details

Consider the reaction

Na2CO3(s)→Na2O(s)+CO2(g)

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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