Interpretation: The thermochemical equation for the combustion reaction is to be written.
Concept introduction: Thermochemical equations are balanced stoichiometric chemical equations that are accompanied by information about heat change.
Endothermic reactions are the ones in which heat is absorbed and enthalpy change is positive.
The exothermic reactions are the ones in which heat is released and enthalpy change is negative.
Answer to Problem 20LC
The thermochemical equation for the combustion reaction will be
Explanation of Solution
The given reaction is 2 mol of solid magnesium
The reactants and products are accompanied by their physical states with (s) representing solid, (l) representing liquid, (g) representing gas, and (aq) representing the aqueous state.
As the heat is released, the reaction will be exothermic and the enthalpy change for the reaction will be negative.
Thus, the thermochemical equation will be
Chapter 17 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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