The correct thermochemical cquation is (1) C+O2 ⟶CO2 ; ΔH=94 kcal (2) C+O2 ⟶CO2 ; ΔH=+94 kcal (3

step 1 The correct thermochemical equation is there are four possible thermochemical equations given an

The correct thermochemical cquation is (1) C+O2 ⟶CO2 ; ΔH=94...

The correct thermochemical cquation is (1) $\mathrm{C}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2} ; \Delta H=94 \mathrm{kcal}$ (2) $\mathrm{C}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2} ; \Delta H=+94 \mathrm{kcal}$ (3) $\mathrm{C}_{(n)}+\mathrm{O}_{(\mathbb{B})} \longrightarrow \mathrm{CO}_{2 \mathrm{~g}} ; \Delta H=94 \mathrm{kcal}$ (4) $\mathrm{C}_{(8)}+\mathrm{O}_{\mathrm{cg}} \longrightarrow \mathrm{CO}_{2 \mathrm{~m}} ; \Delta H=+94 \mathrm{kcal}$

The correct thermochemical cquation is
(1) $\mathrm{C}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2} ; \Delta H=94 \mathrm{kcal}$
(2) $\mathrm{C}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2} ; \Delta H=+94 \mathrm{kcal}$
(3) $\mathrm{C}_{(n)}+\mathrm{O}_{(\mathbb{B})} \longrightarrow \mathrm{CO}_{2 \mathrm{~g}} ; \Delta H=94 \mathrm{kcal}$
(4) $\mathrm{C}_{(8)}+\mathrm{O}_{\mathrm{cg}} \longrightarrow \mathrm{CO}_{2 \mathrm{~m}} ; \Delta H=+94 \mathrm{kcal}$

Key Concepts

Thermochemical Equations

Thermochemical equations are balanced chemical equations that include the enthalpy change of the reaction. They show not only the reactants and products with correct stoichiometry but also specify the amount of energy absorbed or released during the process. These equations are essential in understanding the energy profile of a chemical reaction and are used to predict whether a reaction is exothermic or endothermic.

Enthalpy Change (?H)

Enthalpy change, represented by ?H, indicates the heat absorbed or released at constant pressure during a reaction. A negative value of ?H signifies an exothermic reaction (where energy is released), while a positive value indicates an endothermic reaction (where energy is absorbed). Correctly representing the sign of ?H in thermochemical equations is crucial for accurately describing the energy dynamics of a chemical process.

State Notation in Chemical Equations

State notation involves adding symbols to chemical species in an equation to indicate their physical states—solid (s), liquid (l), gas (g), or aqueous (aq). This notation is important in thermochemistry as it gives context to the conditions under which the reaction occurs and can affect the interpretation of the thermodynamic details of the process.

Reaction Stoichiometry and Notation

Accurate reaction stoichiometry ensures that a chemical equation is properly balanced in terms of atoms and charge. In thermochemical equations, it is also vital to include consistent notation for elements and compounds, ensuring clarity in both the reactants and products. This careful notation helps in preventing misinterpretations regarding the reaction’s mechanism and the corresponding energy changes.

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