Use the information given here, data from Appendix D, and...

Use the information given here, data from Appendix D, and equation (7.22) to calculate the standard enthalpy of formation per mole of $\mathrm{ZnS}(\mathrm{s})$ $$\begin{aligned} 2 \mathrm{ZnS}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{g}) \longrightarrow 2 \mathrm{ZnO}(\mathrm{s}) &+2 \mathrm{SO}_{2}(\mathrm{g}) \\ \Delta_{\mathrm{r}} H^{\circ} &=-878.2 \mathrm{kJ} \mathrm{mol}^{-1} \end{aligned}$$

Use the information given here, data from Appendix D, and equation (7.22) to calculate the standard enthalpy of formation per mole of $\mathrm{ZnS}(\mathrm{s})$
$$\begin{aligned}
2 \mathrm{ZnS}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{g}) \longrightarrow 2 \mathrm{ZnO}(\mathrm{s}) &+2 \mathrm{SO}_{2}(\mathrm{g}) \\
\Delta_{\mathrm{r}} H^{\circ} &=-878.2 \mathrm{kJ} \mathrm{mol}^{-1}
\end{aligned}$$

Key Concepts

Standard Enthalpy of Formation

The standard enthalpy of formation is the change in enthalpy when one mole of a compound is formed from its constituent elements in their standard states. This concept provides a baseline for calculating the energy changes associated with chemical reactions by comparing the energy of products with that of the reactants formed under standard conditions.

Hess's Law

Hess's Law states that the total enthalpy change for a reaction is the same regardless of the number of steps taken to carry out the reaction. This principle allows the use of known enthalpy changes from related reactions to calculate unknown enthalpy changes by constructing a pathway between reactants and products.

Reaction Enthalpy

Reaction enthalpy is the overall energy change during a chemical reaction, calculated as the difference between the sum of the enthalpies of formation of the products and that of the reactants. It is used to relate known reaction data, such as the enthalpy change for a balanced chemical equation, to determine the enthalpy of formation of individual compounds.

Stoichiometry

Stoichiometry involves the quantitative relationship between reactants and products in a chemical reaction, as indicated by a balanced equation. It is essential for converting the enthalpy change from a given reaction (which may involve multiple moles of a substance) to the per mole value needed for standard enthalpy of formation calculations.

Transcript

Please give Ace some feedback