Ethane, pentafluoro-
- Formula: C2HF5
- Molecular weight: 120.0214
- IUPAC Standard InChIKey: GTLACDSXYULKMZ-UHFFFAOYSA-N
- CAS Registry Number: 354-33-6
- 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: C2F5H; Pentafluoroethane; 1,1,1,2,2-Pentafluoroethane; Fc-125; Genetron HFC 125; R-125
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Phase change data
Go To: Top, Gas phase ion energetics data, 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
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 227. ± 6. | K | AVG | N/A | Average of 11 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 170. | K | N/A | Young, Fukuhara, et al., 1940 | Uncertainty assigned by TRC = 3. K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 339.22 | K | N/A | Yata, Hori, et al., 1996 | Uncertainty assigned by TRC = 0.3 K; TRC |
Tc | 339.160 | K | N/A | Kuwabara, Aoyama, et al., 1995 | Uncertainty assigned by TRC = 0.04 K; TRC |
Tc | 339.17 | K | N/A | Higashi, 1994 | Uncertainty assigned by TRC = 0.03 K; TRC |
Tc | 339.4 | K | N/A | Wilson, Wilding, et al., 1992 | Uncertainty assigned by TRC = 0.7 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 35.82 | atm | N/A | Tsvetkov, Kletskii, et al., 1995 | Uncertainty assigned by TRC = 0.06 atm; by extrapolation of obs. vapor pressure to selected Tc; TRC |
Pc | 35.726 | atm | N/A | Ye, Sato, et al., 1995 | Uncertainty assigned by TRC = 0.03 atm; calc. from vapor pressure equation fit to data at selected Tc(339.165 K); TRC |
Pc | 35.73 | atm | N/A | Higashi, 1994 | Uncertainty assigned by TRC = 0.07 atm; TRC |
Pc | 35.72 | atm | N/A | Sagawa, Sato, et al., 1994 | Uncertainty assigned by TRC = 0.05 atm; Calculated from vapor pressure curve for Tc = 339.165 K; TRC |
Pc | 34.73 | atm | N/A | Wilson, Wilding, et al., 1992 | Uncertainty assigned by TRC = 1.48 atm; by extrapoltion of vapor pressure equation to Tc; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 4.73 | mol/l | N/A | Kuwabara, Aoyama, et al., 1995 | Uncertainty assigned by TRC = 0.02 mol/l; TRC |
ρc | 4.7658 | mol/l | N/A | Higashi, 1994 | Uncertainty assigned by TRC = 0.05 mol/l; TRC |
ρc | 4.757 | mol/l | N/A | Wilson, Wilding, et al., 1992 | Uncertainty assigned by TRC = 0.07 mol/l; TRC |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
5.45 | 175. | C | Weber, 1999 | AC |
5.23 | 190. | C | Weber, 1999 | AC |
5.00 | 205. | C | Weber, 1999 | AC |
4.85 | 215. | C | Weber, 1999 | AC |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
0.538 | 172.6 | L«65533»ddecke and Magee, 1996 | AC |
Gas phase ion energetics data
Go To: Top, Phase change data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: John E. Bartmess
De-protonation reactions
C2F5- + =
By formula: C2F5- + H+ = C2HF5
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 374.5 ± 3.3 | kcal/mol | G+TS | Sullivan and Beauchamp, 1976 | gas phase; Between tBuOH and HF; value altered from reference due to change in acidity scale |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 366.8 ± 3.2 | kcal/mol | IMRB | Sullivan and Beauchamp, 1976 | gas phase; Between tBuOH and HF; value altered from reference due to change in acidity scale |
References
Go To: Top, Phase change data, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Young, Fukuhara, et al., 1940
Young, D.W.S.; Fukuhara, N.; Bigelow, L.A.,
The Action of Elementary Fluorine Upon Organic Compounds VIII. The Influence of Dilution on the Vapor Phase Fluorination of Ethane,
J. Am. Chem. Soc., 1940, 62, 1171. [all data]
Yata, Hori, et al., 1996
Yata, J.; Hori, M.; Kawakatsu, H.; Minamiyama, T.,
Measurements of refractive index of alternative refrigerants,
Int. J. Thermophys., 1996, 17, 65-74. [all data]
Kuwabara, Aoyama, et al., 1995
Kuwabara, S.; Aoyama, H.; Sato, H.; Watanabe, K.,
Vapor-liquid coexistence curves in the critical region and the critical temperatures and densities of difluoromethane and pentafluoroehtane,
J. Chem. Eng. Data, 1995, 40, 112-116. [all data]
Higashi, 1994
Higashi, Y.,
Critical parameters for HFC134a, HFC32 and HFC125,
Int. J. Refrig., 1994, 17, 524-531. [all data]
Wilson, Wilding, et al., 1992
Wilson, L.C.; Wilding, W.V.; Wilson, G.M.; Rowley, R.L.; Felix, V.M.; Chisolm-Carter, T.,
Thermophysical properties of HFC-125,
Fluid Phase Equilib., 1992, 80, 167-77. [all data]
Tsvetkov, Kletskii, et al., 1995
Tsvetkov, O.B.; Kletskii, A.V.; Laptev, Yu.A.; Asambaev, A.J.; Zausaev, I.A.,
Thermal conductivity and PVT measurements of pentafluoroethane ( refrigerant HFC-125),
Int. J. Thermophys., 1995, 16, 1185-92. [all data]
Ye, Sato, et al., 1995
Ye, F.; Sato, H.; Watanabe, K.,
Gas-phase PVT properties and vapor pressure of pentafluoroethane (HFC-125) determined according to the burnett method,
J. Chem. Eng. Data, 1995, 40, 148-152. [all data]
Sagawa, Sato, et al., 1994
Sagawa, T.; Sato, H.; Watanabe, K.,
Thermodynamic properties of HFC-125 based on (p,V,T) measurements,
High Temp. - High Pressures, 1994, 26, 193-201. [all data]
Weber, 1999
Weber, F.,
Measurement of the specific enthalpy of vaporization of the alternative refrigerant pentafluoroethane in the temperature range from 175 K to 220 K,
PTB-Mitteilungen, 1999, 109, 6, 469. [all data]
L«65533»ddecke and Magee, 1996
L«65533»ddecke, T.O.; Magee, J.W.,
Molar heat capacity at constant volume of difluoromethane (R32) and pentafluoroethane (R125) from the triple-point temperature to 345 K at pressures to 35 MPa,
Int J Thermophys, 1996, 17, 4, 823-849, https://doi.org/10.1007/BF01439192
. [all data]
Sullivan and Beauchamp, 1976
Sullivan, S.A.; Beauchamp, J.L.,
Competition between proton transfer and elimination in the reactions of strong bases with fluoroethanes in the gas phase. Influence of base strength on reactivity,
J. Am. Chem. Soc., 1976, 98, 1160. [all data]
Notes
Go To: Top, Phase change data, Gas phase ion energetics data, References
- Symbols used in this document:
Pc Critical pressure Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point ΔfusH Enthalpy of fusion ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔvapH Enthalpy of vaporization ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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