Properties of Hydrocarbon Gasses

Written by Matt Milbury on . Posted in Tables

Properties of common hydrocarbon gasses are as follows.

Gas

Formula

Molecular Weight, lb/lbmol

Vapor Pressure at 100°F, psia

Critical Constants 

Ideal Gas 14.696 psia, 60°F

Specific Heat, Btu/lb/°F

(at 14.696 psia, 60°F Ideal Gas)

Pressure, psia

Temp, F

Volume, ft3/lb

SpGr (air=1.00) 

ft3/lb-gas

Methane

CH4

16.0430

5000

666.0

-116.66

0.0988

0.5539

23.654

0.52676

Ethane

C2H6

30.0700

800

707.0

90.07

0.0783

1.0382

12.620

0.40789

Propane

C3H8

44.0970

188.650

617.0

205.93

0.0727

1.5226

8.606

0.38847

Isobutane

C4H10

58.1230

72.581

527.9

274.40

0.0714

2.0068

6.529

0.38669

n-butane

C4H10

58.1230

51.706

548.8

305.52

0.0703

2.0068

6.529

0.39500

Iso-pentane

C5H12

72.1500

20.443

490.4

368.96

0.0684

2.4912

5.260

0.38448

n-pentane

C5H12

72.1500

15.575

488.1

385.70

0.0695

2.4912

5.260

0.38831

Neo-pentane

C5H12

72.1500

36.720

464.0

321.01

0.0673

2.4912

5.260

0.39038

n-hexane

C6H14

86.1770

4.960

436.9

453.80

0.0688

2.9755

4.404

0.38631

2-methyl pentane

C6H14

86.1770

6.769

436.6

435.76

0.0682

2.9755

4.404

0.38526

3-methyl pentane

C6H14

86.1770

6.103

452.5

448.20

0.0682

2.9755

4.404

0.37902

Neo hexane

C6H14

86.1770

9.859

446.7

419.92

0.0667

2.9755

4.404

0.38231

2,3-dimethylbutane

C6H14

86.1770

7.406

454.0

440.08

0.0665

2.9755

4.404

0.37762

n-Heptane

C7H16

100.2040

1.621

396.8

512.80

0.0682

3.4598

3.787

0.38449

2-Methylhexane

C7H16

100.2040

2.273

396.0

494.44

0.0673

3.4598

3.787

0.38170

3-Methylhexane

C7H16

100.2040

2.130

407.6

503.62

0.0646

3.4598

3.787

0.37882

Gas

Formula

Molecular Weight, lb/lbmol

Vapor Pressure at 100°F, psia

Critical Constants 

Ideal Gas 14.696 psia, 60°F

Specific Heat, Btu/lb/°F

(at 14.696 psia, 60°F Ideal Gas)

Pressure, psia

Temp, F

Volume, ft3/lb

SpGr (air=1.00) 

ft3/lb-gas

3-Ethylpentane

C7H16

100.2040

2.012

419.2

513.16

0.0665

3.4598

3.787

0.38646

2,2-Dimethylpentane

C7H16

100.2040

3.494

401.8

476.98

0.0665

3.4598

3.787

0.38651

2,4-Dimethylpentane

C7H16

100.2040

3.294

397.4

475.72

0.0667

3.4598

3.787

0.39627

3,3-Dimethylpentane

C7H16

100.2040

2.775

427.9

505.60

0.0662

3.4598

3.787

0.38306

Triptane

C7H16

100.2040

3.376

427.9

496.24

0.0636

3.4598

3.787

0.37724

n-octane

C8H18

114.2310

0.537

360.7

564.15

0.0673

3.9441

3.322

0.38334

Di Isobutyl

C8H18

114.2310

1.102

361.1

530.26

0.0676

3.9441

3.322

0.37571

Isooctane

C8H18

114.2310

1.709

372.7

519.28

0.0657

3.9441

3.322

0.38222

n-Nonane

C9H2O

128.2580

0.172

330.7

610.72

0.0693

4.4284

2.959

0.38248

n-Decane

C10H22

142.2850

0.061

304.6

652.10

0.0702

4.9127

2.667

0.38181

Cyclopentane

C5H10

70.1340

9.917

653.8

461.10

0.0594

2.4215

5.411

0.27122

Methylcyclopentane

C6H12

84.1610

4.491

548.8

499.28

0.0607

2.9059

4.509

0.30027

Cyclohexane

C6H12

84.1610

3.267

590.7

536.60

0.0586

2.9059

4.509

0.29012

Methylcyclohexane

C7H14

98.1880

1.609

503.4

570.20

0.0600

3.3902

3.865

0.31902

Ethylene

C2H4

28.0540

1400.000

731.0

48.54

0.0746

0.9686

13.527

0.35789

Propylene

C3H6

42.0810

232.800

676.6

198.31

0.0717

1.4529

9.018

0.35683

Gas

Formula

Molecular Weight, lb/lbmol

Vapor Pressure at 100°F, psia

Critical Constants 

Ideal Gas 14.696 psia, 60°F

Specific Heat, Btu/lb/°F

(at 14.696 psia, 60°F Ideal Gas)

Pressure, psia

Temp, F

Volume, ft3/lb

SpGr (air=1.00) 

ft3/lb-gas

Butylene

C4H8

56.1080

62.550

586.4

296.18

0.0683

1.9373

6.764

0.35535

Cis-2-Butene

C4H8

56.1080

45.970

615.4

324.31

0.0667

1.9373

6.764

0.33275

Trans-2-Butene

C4H8

56.1080

49.880

574.9

311.80

0.0679

1.9373

6.764

0.35574

Isobutene

C4H8

56.1080

64.950

580.2

292.49

0.0681

1.9373

6.764

0.36636

1-Pentene

C5H10

70.1340

19.120

509.5

376.86

0.0674

2.4215

5.411

0.35944

1,2-Butadene

C4H6

54.0920

36.530

656.0

354.00

0.0700

1.8677

7.016

0.34347

1,3-Butadene

C4H6

54.0920

59.460

620.3

306.00

0.0653

1.8677

7.016

0.34223

Isoprene

C5H8

68.1190

16.680

582.0

403.00

0.0660

2.3520

5.571

0.35072

Acetylene

C2H2

26.0380

890.4

95.29

0.0693

0.8990

14.574

0.39754

Benzene

C6H6

78.1140

3.23

710.4

552.15

0.0531

2.6971

4.858

0.24295

Toluene

C7H8

92.1410

1.03

595.5

605.50

0.0549

3.1814

4.118

0.26005

Ethyl-benzene

C8H10

106.1670

0.37

523.0

651.22

0.0564

3.6657

3.574

0.27768

o-Xylene

C8H10

106.1670

0.26

541.6

674.85

0.0557

3.6657

3.574

0.28964

m-Xylene

C8H10

106.1670

0.33

512.9

650.95

0.0567

3.6657

3.574

0.27427

p-Xylene

C8H10

106.1670

0.34

509.2

649.47

0.0572

3.6657

3.574

0.27470

Styrene

C8H8

104.1520

0.26

587.8

703.00

0.0534

3.5961

3.644

0.26682

Isopropylbenzene

C9H12

120.1940

0.19

465.4

676.20

0.0569

4.1500

3.157

0.30704

Methyl Alcohol

CH4O

32.0420

4.63

1174.0

463.01

0.0590

1.1063

11.843

0.32429

Ethyl Alcohol

C2H6O

46.0690

2.31

891.7

465.31

0.0581

1.5906

8.237

0.33074

Carbon Monoxide

CO

28.0100

506.8

-220.51

0.0527

0.9671

13.548

0.24847

 

Carbon Dioxide

CO2

44.0100

1071.0

87.73

0.0342

1.5196

8.623

0.19909

 

Hydrogen Sulfide

H2S

34.0820

394.59

1306.0

212.40

0.0461

1.1768

11.134

0.23838

Sulfur Dioxide

SO2

64.0650

85.46

1143.0

315.70

0.0305

2.2120

5.924

0.14802

Ammonia

NH3

17.0305

211.90

1647.0

270.20

0.0681

0.5880

22.283

0.49678

Air

N2+O2

28.9625

546.9

-221.29

0.0517

1.0000

13.103

0.23980

 

Hydrogen

H2

2.0159

187.5

-400.30

0.5101

0.0696

188.250

3.40660

 

Oxygen

O2

31.9988

731.4

-181.40

0.0367

1.1048

11.859

0.21897

 

Nitrogen

N2

28.0134

493.0

-232.48

0.0510

0.9672

13.546

0.24833

 

Chlorine

Cl2

70.9054

157.30

1157.0

290.69

0.0280

2.4482

5.352

0.11375

Water

H2O

18.0153

0.95

3200.1

705.10

0.0498

0.6220

21.065

0.44469

Helium

He

4.0026

33.0

-450.31

0.2300

0.1382

94.814

1.24040

 

Hydrogen Chloride

HCI

36.4606

906.71

1205.0

124.75

0.0356

1.2589

10.408

0.19086

Gas

Formula

Molecular Weight, lb/lbmol

Vapor Pressure at 100°F, psia

Critical Constants 

Ideal Gas 14.696 psia, 60°F

Specific Heat, Btu/lb/°F

(at 14.696 psia, 60°F Ideal Gas)

Pressure, psia

Temp, F

Volume, ft3/lb

SpGr (air=1.00) 

ft3/lb-gas