2-Methyl-1-butene
- Formula: C5H10
- Molecular weight: 70.1329
- IUPAC Standard InChIKey: MHNNAWXXUZQSNM-UHFFFAOYSA-N
- CAS Registry Number: 563-46-2
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: 1-Butene, 2-methyl-; γ-Isoamylene; 1-Isoamylene; C2H5C(CH3)=CH2; 2-Methylbutene-1; Isopentene; UN 2371; UN 2459; 2-methylbut-1-ene
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Phase change data
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 304.3 ± 0.7 | K | AVG | N/A | Average of 35 out of 38 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 136. ± 3. | K | AVG | N/A | Average of 6 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 135.60 | K | N/A | Chao, Hall, et al., 1983 | Uncertainty assigned by TRC = 0.02 K; TRC |
Ttriple | 135.62 | K | N/A | Todd, Oliver, et al., 1947 | Uncertainty assigned by TRC = 0.02 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 470. | K | N/A | Majer and Svoboda, 1985 | |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 26.19 | kJ/mol | N/A | Majer and Svoboda, 1985 | |
ΔvapH° | 25.9 | kJ/mol | N/A | Reid, 1972 | AC |
ΔvapH° | 25.9 ± 0.1 | kJ/mol | C | Scott, Waddington, et al., 1949 | AC |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
25.5 | 304.3 | N/A | Majer and Svoboda, 1985 | |
28.5 | 255. | A | Stephenson and Malanowski, 1987 | Based on data from 240. to 336. K.; AC |
27.3 | 289. | N/A | Scott, Waddington, et al., 1949 | Based on data from 274. to 336. K.; AC |
25.5 ± 0.1 | 304. | C | Scott, Waddington, et al., 1949 | AC |
Enthalpy of vaporization
ΔvapH =
A exp(-βTr) (1 − Tr)β
ΔvapH =
Enthalpy of vaporization (at saturation pressure)
(kJ/mol)
Tr = reduced temperature (T / Tc)
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Temperature (K) | A (kJ/mol) | β | Tc (K) | Reference | Comment |
---|---|---|---|---|---|
278. to 304. | 41.2 | 0.2839 | 470. | Majer and Svoboda, 1985 |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
274.30 to 335.82 | 3.98652 | 1047.811 | -41.089 | Scott, Waddington, et al., 1949 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
7.911 | 135.60 | Chao, Hall, et al., 1983, 2 | DH |
7.9103 | 135.62 | Todd, Oliver, et al., 1947, 2 | DH |
5.36 | 104.7 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
58.34 | 135.60 | Chao, Hall, et al., 1983, 2 | DH |
58.33 | 135.62 | Todd, Oliver, et al., 1947, 2 | DH |
References
Go To: Top, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chao, Hall, et al., 1983
Chao, J.; Hall, K.R.; Yao, J.M.,
Thermodynamic Properties of Simple Alkenes,
Thermochim. Acta, 1983, 64, 285. [all data]
Todd, Oliver, et al., 1947
Todd, S.S.; Oliver, G.D.; Huffman, H.M.,
The heat capacities, heats of fusion and entropies of the six pentenes.,
J. Am. Chem. Soc., 1947, 69, 1519. [all data]
Majer and Svoboda, 1985
Majer, V.; Svoboda, V.,
Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]
Reid, 1972
Reid, Robert C.,
Handbook on vapor pressure and heats of vaporization of hydrocarbons and related compounds, R. C. Wilhort and B. J. Zwolinski, Texas A Research Foundation. College Station, Texas(1971). 329 pages.$10.00,
AIChE J., 1972, 18, 6, 1278-1278, https://doi.org/10.1002/aic.690180637
. [all data]
Scott, Waddington, et al., 1949
Scott, D.W.; Waddington, G.; Smith, J.C.; Huffman, H.M.,
Thermodynamic properties of three isomeric pentenes,
J. Am. Chem. Soc., 1949, 71, 2767-2773. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
Chao, Hall, et al., 1983, 2
Chao, J.; Hall, K.R.; Yao, J.M.,
Thermodynamic properties of simple alkenes,
Thermochim. Acta, 1983, 64(3), 285-303. [all data]
Todd, Oliver, et al., 1947, 2
Todd, S.S.; Oliver, G.D.; Huffman, H.M.,
The heat capacities, heats of fusion and entropies of the six pentenes,
J. Am. Chem. Soc., 1947, 69, 1519-1525. [all data]
Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D.,
Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III,
J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985
. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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