4. Consider the combustion of methanol a) Draw the Lewis structures of the m

Chemistry & Chemical Reactivity
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ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 69GQ: Use Appendix L to find the standard enthalpies of formation of oxygen atoms, oxygen molecules (O2),...
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4. Consider the combustion of methanol: 2 CH3OH (g) + 3 02 (g) → 2 CO2 (g) + 4 H20 (g)
a) Draw the Lewis structures of the molecules in the reaction.
b) List the bonds broken and formed, along with the number of each bond and the bond energies, then
calculate the estimated AHrxn.
Bonds broken
Bonds formed
Bond
B.E. (kJ/mol)
Bond B.E. (kJ/mol)
C-C
347
C=0*
799
C-H
414
O-H
464
C-O
360
O=0
498
C=0
745
*in CO2
c) Calc. AHrxn using formation values.
AH°/(kJ/mol):
CH3ОН (-201.0)
CO2 (-393.5)
H20 (-241.8)
Transcribed Image Text:4. Consider the combustion of methanol: 2 CH3OH (g) + 3 02 (g) → 2 CO2 (g) + 4 H20 (g) a) Draw the Lewis structures of the molecules in the reaction. b) List the bonds broken and formed, along with the number of each bond and the bond energies, then calculate the estimated AHrxn. Bonds broken Bonds formed Bond B.E. (kJ/mol) Bond B.E. (kJ/mol) C-C 347 C=0* 799 C-H 414 O-H 464 C-O 360 O=0 498 C=0 745 *in CO2 c) Calc. AHrxn using formation values. AH°/(kJ/mol): CH3ОН (-201.0) CO2 (-393.5) H20 (-241.8)
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