The standard enthalpy of formation of solid barium oxide, BaO, is -553.5 kJ / mol, and the stand

step 1 All right, so for this one, we're asked to find the Anthropi of Reaction and see if it's exother

The standard enthalpy of formation of solid barium oxide,...

The standard enthalpy of formation of solid barium oxide, $\mathrm{BaO},$ is $-553.5 \mathrm{kJ} / \mathrm{mol},$ and the standard enthalpy of formation of barium peroxide, $\mathrm{BaO}_{2},$ is $-634.3 \mathrm{kJ} / \mathrm{mol}$ (a) Calculate the standard enthalpy change for the following reaction. Is the reaction exothermic or endothermic? $2 \mathrm{BaO}_{2}(\mathrm{s}) \rightarrow 2 \mathrm{BaO}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g})$ (b) Draw an energy level diagram that shows the relationship between the enthalpy change of the decomposition of $\mathrm{BaO}_{2}$ to $\mathrm{BaO}$ and $\mathrm{O}_{2}$ and the enthalpies of formation of $\mathrm{BaO}(\mathrm{s})$ and $\mathrm{BaO}_{2}(\mathrm{s})$

The standard enthalpy of formation of solid barium oxide, $\mathrm{BaO},$ is $-553.5 \mathrm{kJ} / \mathrm{mol},$ and the standard enthalpy of formation of barium peroxide, $\mathrm{BaO}_{2},$ is $-634.3 \mathrm{kJ} / \mathrm{mol}$
(a) Calculate the standard enthalpy change for the following reaction. Is the reaction exothermic or endothermic?
$2 \mathrm{BaO}_{2}(\mathrm{s}) \rightarrow 2 \mathrm{BaO}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g})$
(b) Draw an energy level diagram that shows the relationship between the enthalpy change of the decomposition of $\mathrm{BaO}_{2}$ to $\mathrm{BaO}$ and $\mathrm{O}_{2}$ and the enthalpies of formation of $\mathrm{BaO}(\mathrm{s})$ and $\mathrm{BaO}_{2}(\mathrm{s})$

Key Concepts

Standard Enthalpy of Formation

This concept refers to the heat change when one mole of a compound is formed from its constituent elements in their most stable forms under standard conditions. It serves as a reference for calculating the enthalpy changes of reactions by providing a baseline energy level for each compound involved.

Enthalpy Change of Reaction

This is the overall heat absorbed or released during a chemical reaction, calculated as the difference between the sum of the standard enthalpies of formation of the products and those of the reactants. It indicates whether a reaction is exothermic or endothermic.

Exothermic and Endothermic Reactions

These terms categorize reactions based on the direction of energy flow. Exothermic reactions release heat to the surroundings while endothermic reactions absorb heat. This classification is directly linked to the sign of the enthalpy change for the reaction.

Energy-Level Diagram

An energy-level diagram is a visual representation that shows the relative energies of reactants and products. It helps in understanding the energy changes in a reaction by illustrating the starting energy level, the final energy level, and the enthalpy change, thereby providing a clear depiction of whether the reaction releases or absorbs energy.

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