When C(s,graphite) reacts with O2(g) to form CO2(g) , 394 kJ of energy are evolved for each mole of C(s,graphite) that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive. Use the SMALLEST INTEGER coefficients possible and put the energy term (including the units) in the last box on the appropriate side of the equation.

The thermochemical equation for the reaction between graphite (C) and oxygen (O₂) to form CO₂ with the evolution of 394 kJ of heat is given below:

C (s) + O₂ (g) ---> CO₂ (g) ΔH = - 394 kJ

What are thermochemical equations?

Thermochemical equations are equations that show the reactants and products of a reaction as well as the heat changes that occur in the reaction.

The heat changes that occur in a reaction are the heat that is evolved or absorbed when reactants form products.

Reactions in which heat is given off are known as exothermic reactions whereas reactions in which heat is absorbed are endothermic reactions.

The heat change that occurs in a given reaction is written as ΔH. Exothermic reactions have negative ΔH values whereas endothermic reactions have positive ΔH values.

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