18-20. (12 pts) Consider the molecule “pentane," viewing the C2-C3 bond. Me Me Me Et Me Et H. 3 -H H. H H. H H H H. Et Et A B D Interaction Energy cost (KJ/mol) Potential methyl/methyl gauche 3.8 Energy (KJ/mol) methyl/ethyl gauche 4.2 methyl/H eclipse 6.0 ethyl/H eclipse 6.4 methyl/methyl eclipse 11.0 methyl/ethyl eclipse 12.0 НН eclipse 4.0 60° 120° 180° 240° 300° Dihedral Angle Which he following conformations is the least stable conformation? a) А b) B с) С d) D e) all Based on the table regarding energy costs, what is the total energy cost of the conformation B? a) 3.8 KJ/mol b) 4.2 KJ/mol c) 12 KJ/mol d) 15.8 KJ/mol e) 16.4 KJ/mol Based on the table regarding total energy costs, what is the total energy cost of the conformation C? a) 12 KJ/mol b) 15.8 KJ/mol c) 16.4 KJ/mol d) 17.4 KJ/mol e) 20 KJ/mol

18-20. (12 pts) Consider the molecule “pentane," viewing the C2-C3 bond. Me Me Me Et Me Et H. 3 -H H. H H. H H H H. Et Et A B D Interaction Energy cost (KJ/mol) Potential methyl/methyl gauche 3.8 Energy (KJ/mol) methyl/ethyl gauche 4.2 methyl/H eclipse 6.0 ethyl/H eclipse 6.4 methyl/methyl eclipse 11.0 methyl/ethyl eclipse 12.0 НН eclipse 4.0 60° 120° 180° 240° 300° Dihedral Angle Which he following conformations is the least stable conformation? a) А b) B с) С d) D e) all Based on the table regarding energy costs, what is the total energy cost of the conformation B? a) 3.8 KJ/mol b) 4.2 KJ/mol c) 12 KJ/mol d) 15.8 KJ/mol e) 16.4 KJ/mol Based on the table regarding total energy costs, what is the total energy cost of the conformation C? a) 12 KJ/mol b) 15.8 KJ/mol c) 16.4 KJ/mol d) 17.4 KJ/mol e) 20 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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