Bond cnergics of (1] I I),(O=O) and (O II ) are 105,120 and 220 kcal / mol, respectively, th

step 1 Bond energies of 2 hydrogen atoms, 2 oxygen atoms and oxygen and hydrogen atom are 105, 120 and

Bond cnergics of (1] I I),(O=O) and (O II ) are 105,120...

Bond cnergics of $(1] \quad I I),(O=O)$ and $(O \quad$ II $)$ are 105,120 and $220 \mathrm{kcal} / \mathrm{mol}$, respectively, then $\Delta$ in the rcaction is cqual to $2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(1)$ $\begin{array}{ll}\text { (1) }-115 & \text { (2) }-130\end{array}$ (3) $-118$ (4) $-550$

Bond cnergics of $(1] \quad I I),(O=O)$ and $(O \quad$ II $)$ are 105,120 and $220 \mathrm{kcal} / \mathrm{mol}$, respectively, then $\Delta$ in the rcaction is cqual to $2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(1)$
$\begin{array}{ll}\text { (1) }-115 & \text { (2) }-130\end{array}$
(3) $-118$
(4) $-550$

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Key Concepts

Energy Balance in Chemical Reactions

Energy balance involves applying the conservation of energy to chemical reactions. In this context, the overall reaction enthalpy is computed by summing the energies needed for bond breaking (an endothermic process) and subtracting the energies released from bond formation (an exothermic process), which helps in predicting whether a reaction is exothermic or endothermic.

Bond Energy

Bond energy is the amount of energy required to break a chemical bond in one mole of molecules in the gaseous state. It indicates the strength of a bond; a higher bond energy means a stronger bond that requires more energy to break, while a lower bond energy corresponds to a weaker bond.

Enthalpy Change of Reaction

The enthalpy change of a reaction is a measure of the total energy absorbed or released during a chemical reaction. It is determined by calculating the difference between the energy required to break the bonds in the reactants and the energy released when new bonds are formed in the products.

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