The heat energy lost by an exothermic reaction is characterized as a negative ch

Question

The heat energy lost by an exothermic reaction is characterized as a negative change of enthalpy of the reaction (H°rxn ). Heat energy is measured in joules while the closely related change in enthalpy is measured in kilojoules/mole accounting for the amount of heat produced by each molecule. If 485 J of heat (q) is produced by a given reaction of 0.032 moles of a given reactant, what is the molar enthalpy change (H°rxn) relative to that reactant in kJ/mol? Enter the numerical answer in decimal format

Explanation / Answer

Molar enthalpy change = heat / number of moles

H°rxn = q / n

H°rxn = 485 / 0.032

H°rxn = 15156 J/mol

H°rxn = 15.156 kJ/mol

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