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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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
Transcribed Image Text:Two possible Lewis electron-dot diagrams for fulminic acid,
HCNO, are shown below.
Н—С%3DN—ӧ:
Н—ё—N—ӧ:
a. Explain why the diagram on the left is the better
representation for the bonding in fulminic acid. Justify
your choice based on formal charges.
Fulminic acid can convert to isocyanic acid according
to the equation below.
HCNO(g)=HNCO(g)
fulminic acid - isocyanic acid
Fulminic Acid
Isoeyanie Acid
н-сек-ф
н—й—с-б
b. Using the Lewis electron-dot diagrams of fulminic acid
and isocyanic acid shown in the boxes above and the
table of average bond enthalpies below, determine the
value of AH for the reaction of HCNO(g) to form
HNCO(g).
Enthalpy
(kJ/mol)
Enthalpy
(kJ/mol)
Enthalpy
(kJ/mol)
Bond
Bond
Bond
N-O
201
C-N
615
Н-С
413
c=0
745
C=N
891
Н-N
391
c. A student claims that AS for the reaction is close to
zero. Explain why the student's claim is accurate.
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