Properties of Hydrocarbon Gasses

Properties of Hydrocarbon Gasses

Properties of common hydrocarbon gasses are as follows.

Gas

Formula

Molecular Weight, lb/lb_mol

Vapor Pressure at 100°F, psi_a

Critical Constants 

Ideal Gas 14.696 psi_a, 60°F

Specific Heat, Btu/lb/°F

(at 14.696 psia, 60°F Ideal Gas)

Pressure, psi_a

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/lb_mol

Vapor Pressure at 100°F, psi_a

Critical Constants 

Ideal Gas 14.696 psi_a, 60°F

Specific Heat, Btu/lb/°F

(at 14.696 psia, 60°F Ideal Gas)

Pressure, psi_a

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/lb_mol

Vapor Pressure at 100°F, psi_a

Critical Constants 

Ideal Gas 14.696 psi_a, 60°F

Specific Heat, Btu/lb/°F

(at 14.696 psia, 60°F Ideal Gas)

Pressure, psi_a

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/lb_mol

Vapor Pressure at 100°F, psi_a

Critical Constants 

Ideal Gas 14.696 psi_a, 60°F

Specific Heat, Btu/lb/°F

(at 14.696 psia, 60°F Ideal Gas)

Pressure, psi_a

Temp, F

Volume, ft³/lb

SpGr (air=1.00) 

ft³/lb-gas