Calculate the standard molar enthalpy of formation of NO(g)...

Calculate the standard molar enthalpy of formation of $\mathrm{NO}(g)$ from the following data: $$\begin{array}{ll} \mathrm{N}_{2}(g)+2 \mathrm{O}_{2} \longrightarrow 2 \mathrm{NO}_{2}(g) & \Delta H^{\circ}=66.4 \mathrm{kJ} \\ 2 \mathrm{NO}(g)+\mathrm{O}_{2} \longrightarrow 2 \mathrm{NO}_{2}(g) & \Delta H^{\circ}=-114.1 \mathrm{kJ} \end{array}$$

Calculate the standard molar enthalpy of formation of $\mathrm{NO}(g)$ from the following data:
$$\begin{array}{ll}
\mathrm{N}_{2}(g)+2 \mathrm{O}_{2} \longrightarrow 2 \mathrm{NO}_{2}(g) & \Delta H^{\circ}=66.4 \mathrm{kJ} \\
2 \mathrm{NO}(g)+\mathrm{O}_{2} \longrightarrow 2 \mathrm{NO}_{2}(g) & \Delta H^{\circ}=-114.1 \mathrm{kJ}
\end{array}$$

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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 path taken between the reactants and products, because enthalpy is a state function. This principle allows one to determine the enthalpy change of a complicated reaction by algebraically combining several simpler reactions with known enthalpies.

Thermochemical Equations

Thermochemical equations are balanced chemical equations that include the corresponding enthalpy changes for the reactions. They serve as a practical tool in thermodynamics for using Hess's Law, as they allow for the manipulation, addition, or reversal of equations to derive the enthalpy change for a desired overall reaction.

Standard Molar Enthalpy of Formation

The standard molar enthalpy of formation is the heat change that occurs when one mole of a substance is formed from its constituent elements in their standard states. This is a fundamental concept in thermochemistry, providing a reference point for calculating the energy changes in chemical reactions and assessing the stability of compounds.

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