For each generic reaction, determine the value of ΔH2 in terms of ΔH1. a. A+B ⟶2 C ΔH1 2 C ⟶A+

step 1 In this question we're going to be applying Heciss law, which states that the overall end of the

For each generic reaction, determine the value of ΔH2 in...

For each generic reaction, determine the value of $\Delta H_{2}$ in terms of $\Delta H_{1}$. a. $\mathrm{A}+\mathrm{B} \longrightarrow 2 \mathrm{C} \quad \Delta H_{1}$ $2 \mathrm{C} \longrightarrow \mathrm{A}+\mathrm{B} \quad \Delta H_{2}=?$ b. $\mathrm{A}+{ }^{1} / 2 \mathrm{~B} \longrightarrow \mathrm{C} \quad \Delta H_{1}$ $2 \mathrm{~A}+\mathrm{B} \longrightarrow 2 \mathrm{C} \quad \Delta H_{2}=?$ c. $\mathrm{A} \longrightarrow \mathrm{B}+2 \mathrm{C} \quad \Delta H_{1}$ ${ }^{1} / 2 \mathrm{~B}+\mathrm{C} \longrightarrow 1 / 2 \mathrm{~A} \quad \Delta H_{2}=?$

For each generic reaction, determine the value of $\Delta H_{2}$ in terms of $\Delta H_{1}$. a. $\mathrm{A}+\mathrm{B} \longrightarrow 2 \mathrm{C} \quad \Delta H_{1}$
$2 \mathrm{C} \longrightarrow \mathrm{A}+\mathrm{B} \quad \Delta H_{2}=?$
b. $\mathrm{A}+{ }^{1} / 2 \mathrm{~B} \longrightarrow \mathrm{C} \quad \Delta H_{1}$
$2 \mathrm{~A}+\mathrm{B} \longrightarrow 2 \mathrm{C} \quad \Delta H_{2}=?$
c. $\mathrm{A} \longrightarrow \mathrm{B}+2 \mathrm{C} \quad \Delta H_{1}$
${ }^{1} / 2 \mathrm{~B}+\mathrm{C} \longrightarrow 1 / 2 \mathrm{~A} \quad \Delta H_{2}=?$

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Key Concepts

Hess's Law

Hess's Law states that the total enthalpy change for a reaction is independent of the pathway taken, meaning that the enthalpy change is a state function. This principle allows us to add and subtract reactions and their enthalpy changes in order to determine the enthalpy change of a target reaction by combining other reactions whose enthalpy changes are known.

Reaction Reversal

Reversing a chemical reaction involves writing the reaction in the opposite direction. When a reaction is reversed, the sign of its enthalpy change is also reversed. This concept is critical when using Hess's Law to determine unknown enthalpy changes because it allows you to align reaction directions correctly when combining multiple reactions.

Stoichiometric Scaling

Stoichiometric scaling involves multiplying the coefficients of a chemical equation by a factor, which in turn multiplies the enthalpy change by the same factor. This is important when reactions are combined in Hess's Law calculations because the reactions must be balanced in terms of the species involved, and their enthalpy changes need to be adjusted accordingly.

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