Average Bond Enthalpies

Single Bonds

C—H

413

N—H

391

O—H

463

F—F

155

C—C

348

N—N

163

O—O

146

Cl—Cl

242

C—N

293

N—O

201

Br—Br

193

C—O

358

N—F

272

I—I

151

C—F

485

N—Cl

200

C—Cl

328

N—Br

243

C—Br

276

C—I

240

C—S

259

Si—H

323

H—H

436

S—H

339

Si—Si

226

H—F

567

Si—C

301

H—Cl

431

Si—O

368

H—Br

366

Si—Cl

464

H—I

299

Multiple Bonds

C=C

614

N=N

418

O=O

495

S=S

418

C≡C

839

N≡N

941

S=O

523

C=N

615

N=O

607

C≡N

891

C=O

799

C≡O

1072