Consider the following reaction: A2+B2 ⟶2 AB ΔH=-285 kJ The bond energy for A2 is one-half th

Name: Problem 72, Chapter 8: Chemistry
Uploaded: 2019-08-19T15:20:46-08:00
Duration: 1 min 55 s
Channel: Lena Jake
Description: Consider the following reaction: A2+B2 ⟶2 AB ΔH=-285 kJ The bond energy for A2 is one-half the amount of the AB bond energy. The bond energy of B2=432 kJ / mol. What is the bond energy of A2 ?

step 1 So in this video we're going to talk about question 78 from chapter 8, which says, consider the

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Consider the following reaction: $$ \mathrm{A}_{2}+\mathrm{B}_{2} \longrightarrow 2 \mathrm{AB} \quad \Delta H=-285 \mathrm{~kJ} $$ The bond energy for $\mathrm{A}_{2}$ is one-half the amount of the $\mathrm{AB}$ bond energy. The bond energy of $\mathrm{B}_{2}=432 \mathrm{~kJ} / \mathrm{mol}$. What is the bond energy of $\mathrm{A}_{2}$ ?

   Consider the following reaction:
$$
\mathrm{A}_{2}+\mathrm{B}_{2} \longrightarrow 2 \mathrm{AB} \quad \Delta H=-285 \mathrm{~kJ}
$$
The bond energy for $\mathrm{A}_{2}$ is one-half the amount of the $\mathrm{AB}$ bond energy. The bond energy of $\mathrm{B}_{2}=432 \mathrm{~kJ} / \mathrm{mol}$. What is the bond energy of $\mathrm{A}_{2}$ ?

Chemistry

Steven S. Zumdahl,… 8th Edition

Chapter 8, Problem 72

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Solved by Expert Lena Jake

08/19/2019

Step 1

We know that the bond energy of A2 is half the bond energy of AB. Let's represent the bond energy of A2 as x and the bond energy of AB as 2x. Show more…

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Consider the following reaction: $$ \mathrm{A}_{2}+\mathrm{B}_{2} \longrightarrow 2 \mathrm{AB} \quad \Delta H=-285 \mathrm{~kJ} $$ The bond energy for $\mathrm{A}_{2}$ is one-half the amount of the $\mathrm{AB}$ bond energy. The bond energy of $\mathrm{B}_{2}=432 \mathrm{~kJ} / \mathrm{mol}$. What is the bond energy of $\mathrm{A}_{2}$ ?

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Key Concepts

Thermochemical Energy Calculations

Thermochemical energy calculations involve using bond energies and stoichiometric coefficients to determine the net energy change of a reaction. By accounting for the energy needed to break bonds in reactants and the energy released upon formation of bonds in products, one can derive unknown bond energies or verify the consistency of reaction enthalpies.

Bond Energy

Bond energy is the measure of the strength of a chemical bond, defined as the energy required to break the bond in a molecule. It plays a crucial role in evaluating the energy changes when chemical reactions occur, as bonds must be broken and new ones formed.

Reaction Enthalpy

Reaction enthalpy is the overall amount of heat absorbed or released during a chemical reaction. It is determined by subtracting the total energy released from forming new bonds from the total energy required to break initial bonds.

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