The reason for calculation of Δ H r x n ° using bond enthalpies not always agreeing with that of Δ H r x n ° calculated using Δ H f ° values has to be explained. Concept Introduction: Δ H ° refers to change in enthalpy. Change in enthalpy in a reaction and bond energy (BE) are related as, ΔH° = ΣBE(reactants)-ΣBE(products) Change in enthalpy in a reaction and enthalpy of formation are related by the formula, Δ H r x n ° = Σ Δ H f ° ( p r o d u c t ) − Σ Δ H f ° ( r e a c tan t ) Where, Δ H r x n ° = standard enthalpy change in reaction Δ H f ° ( p r o d u c t ) = standard enthalpy of formation of product Δ H f ° ( r e a c tan t ) = standard enthalpy of formation of r e a c tan t

Question

Want to see the full answer?

Answer 1

Question

Chapter 9.10, Problem 1RC

Interpretation Introduction

Interpretation:

The reason for calculation of ΔHrxn° using bond enthalpies not always agreeing with that of ΔHrxn° calculated using ΔHf° values has to be explained.

Concept Introduction:

ΔH° refers to change in enthalpy. Change in enthalpy in a reaction and bond energy (BE) are related as,

ΔH° = ΣBE(reactants)-ΣBE(products)

Change in enthalpy in a reaction and enthalpy of formation are related by the formula,

ΔHrxn°=ΣΔHf°(product)−ΣΔHf°(reactant)

Where,

ΔHrxn° = standard enthalpy change in reactionΔHf°(product) = standard enthalpy of formation of productΔHf°(reactant) = standard enthalpy of formation of reactant

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

You are trying to decide if there is a single reagent you can add that will make the following synthesis possible without any other major side products: xi 1. ☑ 2. H₂O хе i Draw the missing reagent X you think will make this synthesis work in the drawing area below. If there is no reagent that will make your desired product in good yield or without complications, just check the box under the drawing area and leave it blank. Click and drag to start drawing a structure. There is no reagent that will make this synthesis work without complications. : ☐ S ☐

Predict the major products of this organic reaction: H OH 1. LiAlH4 2. H₂O ? Note: be sure you use dash and wedge bonds when necessary, for example to distinguish between major products with different stereochemistry. Click and drag to start drawing a structure. G C टे

For each reaction below, decide if the first stable organic product that forms in solution will create a new C-C bond, and check the appropriate box. Next, for each reaction to which you answered "Yes" to in the table, draw this product in the drawing area below. Note for advanced students: for this problem, don't worry if you think this product will continue to react under the current conditions - just focus on the first stable product you expect to form in solution. NH2 CI MgCl ? Will the first product that forms in this reaction create a new CC bond? Yes No MgBr ? Will the first product that forms in this reaction create a new CC bond? Yes No G टे