DATA Page

Standard enthalpy of formation at 298 K: DHf0 (kJ mol-1)

H2S(g)

-21

SO2(g)

-297

H2O(g)

-242

H2O(l)

-285

CO(g)

-111

CO2(g)

-393

Ca(OH)2(s)

-986

NO(g)

+90

NH3(g)

-46

C2H6(g)

-85

C2H4(g)

+52

I2(g)

+62

CaO(s)

-635

SO3(g)

-396

NO2(g)

+33

CH4(g)

-75

NaOH(s)

-427

KCl(s)

-436

KClO3(s)

-391

HCl(g)

-92

N2O(g)

+82

PCl5(g)

-375

PCl3(g)

-287

N2O4(g)

9.2

Ni(CO)4(g)

-602.9

HI(g)

+27

C2H5OH(l)

-278

glucose(s)

-1274

 

Average bond enthalpy at 298 K (kJ mol-1)

N-H

391

N-N

163

C-H

413

C-C

348

H-H

436

O-H

463

N=N

418

NºN

945

C=C

614

CºC

839

C=O

745

O=O

498

 

Enthalpy of vaporisation DHv (kJ mol-1)

CCl4(l) ® CCl4(g)

33

Pb(l) ® Pb(g)

190

 

Miscellanies

Electron affinity of F

-334 kJ mol-1

1st ionisation energy of K

+425 kJ mol-1

Atomisation of Br2 to Br

+193 kJ mol-1

Enthalpy of combusiton of n-hexane

-4163 kJ mol-1

 

Standard Gibbs free energy of formation at 298 K: DGf0 (kJ mol-1)

NH3(g)

-16.5

HI(g)

1.7

I2(g)

19.4

Fe2O3(s)

-745

 

Standard entropy at 298 K: DS0 (J K-1 mol-1)

CO(g)

197.6

Ni(s)

29.9

Ni(CO)4(g)

410.6

CO2(g)

214

C2H5OH(l)

161

glucose(s)

212