The value of Δ H for the isomerization of methyl isocyanide to from acetonitrile needs to be determined. Concept Introduction: For a reaction, the change in enthalpy can be calculated from bond dissociation energy as follows: Δ H = ∑ B . E ( Reactant ) − ∑ B . E ( Product ) That is difference of total energy of bond broken and total energy of bond formed.

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Answer 1

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Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.

Chapter 13, Problem 49E

Interpretation Introduction

Interpretation: The value of ΔH for the isomerization of methyl isocyanide to from acetonitrile needs to be determined.

Concept Introduction: For a reaction, the change in enthalpy can be calculated from bond dissociation energy as follows:

ΔH=∑B.E(Reactant)−∑B.E(Product)

That is difference of total energy of bond broken and total energy of bond formed.

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Methanal can be made through the partial oxidation of methane using O2 in the presence of a catalyst: CH4 (g) + O2 (g) → CH2O(g) + H,O(g) a. Use bond dissociation enthalpies to estimate the enthalpy change for this reaction. Bond ΔΗ (kJ/mol) C-H 413 O=0 498 O=C 745 0-H 463 Enthalpy change = kJ b. Calculate the enthalpy change for this reaction from enthalpies of formation. Substance A;H (kJ/mol) CH4 (g) -74.87 O2 (g) H2 O(g) -241.8 CH20(g) -115.9 Enthalpy change kJ

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The average bond energy (enthalpy) for a C=CC=C double bond is 614 kJ/molkJ/mol and that of a C−CC−C single bond is 348 kJ/molkJ/mol. Estimate the energy needed to break only the ππ bond of the double bond of 2-butene. Express your answer numerically in joules per molecule.

Answer 2

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Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.

Chapter 13, Problem 49E

Interpretation Introduction

Interpretation: The value of ΔH for the isomerization of methyl isocyanide to from acetonitrile needs to be determined.

Concept Introduction: For a reaction, the change in enthalpy can be calculated from bond dissociation energy as follows:

ΔH=∑B.E(Reactant)−∑B.E(Product)

That is difference of total energy of bond broken and total energy of bond formed.

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Answer 3

Question

Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.

Chapter 13, Problem 49E

Interpretation Introduction

Interpretation: The value of ΔH for the isomerization of methyl isocyanide to from acetonitrile needs to be determined.

Concept Introduction: For a reaction, the change in enthalpy can be calculated from bond dissociation energy as follows:

ΔH=∑B.E(Reactant)−∑B.E(Product)

That is difference of total energy of bond broken and total energy of bond formed.

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Check out a sample textbook solution

See solution

Answer 4

Question

Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.

Chapter 13, Problem 49E

Interpretation Introduction