Using bond enthalpies from your reference page, how much energy is stored in 1 mol of HCN? Average Bond Enthalpies (kJ/mol)Single BondsC-H 413C-c 348C-N 293C-0 358C-F 485C-Cl 328C-Br 276C-I 240C-S 259Si-H 323Si-Si 226Si-C 301Si-O 368Multiple BondsC=C 614C=C 839C-N 615C=N 891C OC=0 1072799Cwater =N-H 391N-N 163N-O201272N-FN-Cl200N-Br243Clava = 0.84 J/g°CCice = 2.05 J/gᵒCLfice = 334 J/gH-H436H-F 567H-Cl 431H-Br 366H-I 299Constants Needed:= 4. 184 J/gᵒCN=N 418N=N 941O-H 4630-0146O-F 190O-CI2030-1 234S-H339S-F327S-CI 253S-Br 218S-S 266♪495523S=OS=S 418F-F155Cl-F253CI-CI 242Br-F 237Br-CI 218Br-Br 193I-CI 208I-Br 175I-I151H1.0084311 12Na Mg22.990wnipos

Find out total energy stored in 1 mol of HCN using the given data from image.

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Jsing bond enthalpies from your reference page, how much energy is stored in 1 mol of HCN?

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

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Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

Using bond enthalpies from your reference page, how much energy is stored in 1 mol of HCN?

Average Bond Enthalpies (kJ/mol)
Single Bonds
C-H 413
C-c 348
C-N 293
C-0 358
C-F 485
C-Cl 328
C-Br 276
C-I 240
C-S 259
Si-H 323
Si-Si 226
Si-C 301
Si-O 368
Multiple Bonds
C=C 614
C=C 839
C-N 615
C=N 891
C O
C=0 1072
799
Cwater =
N-H 391
N-N 163
N-O
201
272
N-F
N-Cl
200
N-Br
243
Clava = 0.84 J/g°C
Cice = 2.05 J/gᵒC
Lfice = 334 J/g
H-H
436
H-F 567
H-Cl 431
H-Br 366
H-I 299
Constants Needed:
= 4. 184 J/gᵒC
N=N 418
N=N 941
O-H 463
0-0
146
O-F 190
O-CI
203
0-1 234
S-H
339
S-F
327
S-CI 253
S-Br 218
S-S 266
♪
495
523
S=O
S=S 418
F-F
155
Cl-F
253
CI-CI 242
Br-F 237
Br-CI 218
Br-Br 193
I-CI 208
I-Br 175
I-I
151
H
1.008
4
3
11 12
Na Mg
22.990
wnipos

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