**Organic Chemistry***Maxwell* **Presented by Macmillan Learning**(a) Given the reactions and overall heats of combustion of four cyclic rings, calculate the heat of combustion per CH₂ group.| Compound | Combustion reaction | ΔH for reaction (kJ/mol) | ΔH per CH₂ group (kJ/mol) ||--------------|-----------------------------------------------|--------------------------|---------------------------|| cyclopropane | C₃H₆ + ⁹/₂ O₂ → 3 CO₂ + 3 H₂O | –2091 | ? || cyclobutane | C₄H₈ + 6 O₂ → 4 CO₂ + 4 H₂O | –2744 | ? || cyclopentane | C₅H₁₀ + ¹⁵/₂ O₂ → 5 CO₂ + 5 H₂O | –3320 | ? || cyclohexane | C₆H₁₂ + 9 O₂ → 6 CO₂ + 6 H₂O | –3952 | ? |ΔH per CH₂ for cyclopropane: [________] kJ/mol ΔH per CH₂ for cyclobutane: [________] kJ/molΔH per CH₂ for cyclopentane: [________] kJ/mol ΔH per CH₂ for cyclohexane: [________] kJ/mol(b) Rank the four cycloalkanes in order of stability from least stable to most stable.- Least stable: [________]

The heat of combustion is the amount of heat evolved when one mole of a substance is burnt in the…

(a) Given the reactions and overall heats of combustion of four cyclic rings, calculate the heat of combustion per CH₂ group. AH for reaction (kJ/mol) AH per CH₂ group (kJ/mol) -2091 ? -2744 ? -3320 ? -3952 ? Compound Combustion reaction cyclopropane C₂H₂ + 2O₂ → 3 CO₂ + 3 H₂O cyclobutane C4H8 +60₂ → 4 CO₂ + 4H₂O cyclopentane C₂H₁0 + 1½5-0₂ cyclohexane 5 CO₂ +5H₂O CH₁2 + 9O₂ → 6CO₂ + 6H₂O AH per CH₂ for cyclopropane: AH per CH₂ for cyclopentane: kJ/mol kJ/mol (b) Rank the four cycloalkanes in order of stability from least stable to most stable. AH per CH₂ for cyclobutane: AH per CH₂ for cyclohexane: Least stable kJ/mol kJ/mol

(a) Given the reactions and overall heats of combustion of four cyclic rings, calculate the heat of combustion per CH₂ group. AH for reaction (kJ/mol) AH per CH₂ group (kJ/mol) -2091 ? -2744 ? -3320 ? -3952 ? Compound Combustion reaction cyclopropane C₂H₂ + 2O₂ → 3 CO₂ + 3 H₂O cyclobutane C4H8 +60₂ → 4 CO₂ + 4H₂O cyclopentane C₂H₁0 + 1½5-0₂ cyclohexane 5 CO₂ +5H₂O CH₁2 + 9O₂ → 6CO₂ + 6H₂O AH per CH₂ for cyclopropane: AH per CH₂ for cyclopentane: kJ/mol kJ/mol (b) Rank the four cycloalkanes in order of stability from least stable to most stable. AH per CH₂ for cyclobutane: AH per CH₂ for cyclohexane: Least stable kJ/mol kJ/mol

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Alkanes and Cycloalkanes

Alkanes are saturated organic compounds which are made up of C and H atoms. Alkanes have the general formula of CnH2n+2. Alkane contains sp3 hybridized carbon atoms with four sigmas (σ) bonds & every hydrogen atom is connected with one of the carbon atoms. The size of the alkane could be determined by the number of carbon atoms located in it.

Question

**Organic Chemistry**

*Maxwell*

**Presented by Macmillan Learning**

(a) Given the reactions and overall heats of combustion of four cyclic rings, calculate the heat of combustion per CH₂ group.

| Compound | Combustion reaction | ΔH for reaction (kJ/mol) | ΔH per CH₂ group (kJ/mol) |
|--------------|-----------------------------------------------|--------------------------|---------------------------|
| cyclopropane | C₃H₆ + ⁹/₂ O₂ → 3 CO₂ + 3 H₂O | –2091 | ? |
| cyclobutane | C₄H₈ + 6 O₂ → 4 CO₂ + 4 H₂O | –2744 | ? |
| cyclopentane | C₅H₁₀ + ¹⁵/₂ O₂ → 5 CO₂ + 5 H₂O | –3320 | ? |
| cyclohexane | C₆H₁₂ + 9 O₂ → 6 CO₂ + 6 H₂O | –3952 | ? |

ΔH per CH₂ for cyclopropane: [________] kJ/mol ΔH per CH₂ for cyclobutane: [________] kJ/mol

ΔH per CH₂ for cyclopentane: [________] kJ/mol ΔH per CH₂ for cyclohexane: [________] kJ/mol

(b) Rank the four cycloalkanes in order of stability from least stable to most stable.

- Least stable: [________]

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