1,1,1-trifluoroethane

Structural formula
General
Surname	1,1,1-trifluoroethane
other names	R-143a; Freon 143a;
Molecular formula	C 2 H 3 F 3
Brief description	colorless gas with a sweet smell
External identifiers / databases
EC number	206-996-5
ECHA InfoCard	100.006.361
PubChem	9868
Wikidata	Q161267
properties
Molar mass	84.04 g mol −1
Physical state	gaseous
density	1.1624 g cm −3 (density at boiling point); 3.564 kg m −3 (0 ° C, 1013 mbar);
Melting point	−111.3 ° C
boiling point	−47.2 ° C
safety instructions
H and P phrases	H: 220-280
	P: 210-377-381-403 + 233
Global warming potential	5508 (based on 100 years)
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Trifluoroethane is a gaseous organic-chemical compound from the group of fluorocarbons (PFCs).

properties

Trifluoroethane is an extremely flammable gas which forms explosive mixtures with air. The explosion range is between 9.5 vol.% As the lower explosion limit (LEL) and 19 vol.% As the upper explosion limit (UEL). With a relative gas density of 2.96 (air = 1), the gas is heavier than air and therefore collects on the ground. When the liquid flows out or when large amounts of gas escape, cold mists form and spread across the floor. The vapor pressures at different temperatures are given in the following table:

T in ° C	−10	10	20th	30th	50	70
p in cash	4.4	8.3	11.1	14.4	23.1	35.3

According to Antoine, the vapor pressure function results from log ₁₀ (P) = A− (B / (T + C)) (P in bar, T in K) with A = 4.02423, B = 786.645 and C = −30.093 in the temperature range from 174 K to 226 K.

Compilation of the most important thermodynamic properties
property	Type	Value [unit]	Remarks
Standard enthalpy of formation	Δ _f H ⁰_gas	−748.7 kJ mol ⁻¹
Enthalpy of combustion	Δ _c H ⁰_gas	−1008 kJ mol ⁻¹
Heat capacity	c _p	109.66 J mol ⁻¹ K ⁻¹ (220 K)	as a liquid
Triple point	T _triple	161.82 K
Critical temperature	T _c	345.86K
Critical pressure	p _c	37.64 bar
Critical density	ρ _c	5.16 mol·l ⁻¹

use

C ₂ H ₃ F ₃ is used as a refrigerant .

environment

As a greenhouse gas, trifluoroethane is around 5500 times stronger than CO ₂ . In contrast to chlorofluorocarbons , however, it is not ozone-damaging . In the Kyoto Protocol it is referred to as a “hydrogen-containing fluorocarbon”, the emission of which must be reduced.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Entry for CAS no. 420-46-2 in the GESTIS substance database of the IFA , accessed on April 22, 2016(JavaScript required) .
↑ G. Myhre, D. Shindell et al .: Climate Change 2013: The Physical Science Basis . Working Group I contribution to the IPCC Fifth Assessment Report. Ed .: Intergovernmental Panel on Climate Change . 2013, Chapter 8: Anthropogenic and Natural Radiative Forcing, pp. 24-39; Table 8.SM.16 ( PDF ).
↑ ^a ^b G. Sorbe: Safety characteristics of chemical substances. - 82nd supplementary delivery 6/2001, ecomed Verlag Heidelberg, ISBN 3-609-73060-9 .
↑ H. Russell Jr., DRV Golding, DM Yost: The heat capacity, heats of transition, fusion and vaporization, vapor pressure and entropy of 1,1,1-trifluoroethane. In: J. Am. Chem. Soc. 66 (1944) pp. 16-20. doi : 10.1021 / ja01229a006 .
^ E. Wu, AS Rodgers: Thermochemistry of gas-phase equilibrium CF3CH3 + I2 = CF3CH2I + HI. The carbon-hydrogen bond dissociation energy in 1,1,1-trifluoroethane and the heat of formation of the 2,2,2-trifluoroethyl radical. in J. Phys. Chem. , 1974, 78, pp. 2315-2317.
↑ VP Kolesov, AM Martynov, SM Skuratov: Standard enthalpy of formation of 1,1,1-trifluoroethane. In: Russ. J. Phys. Chem. (Engl. Transl.) 39 (1965) 39, pp. 223-225.
^ ^A ^b H. Russell Jr., DRV Golding, DM Yost: The heat capacity, heats of transition, fusion and vaporization, vapor pressure and entropy of 1,1,1-trifluoroethane. In: J. Am. Chem. Soc. 1944, 66, pp. 16-20.
↑ ^a ^b ^c K. Fujiwara, S. Nakamura, M. Noguchi: Critical Parameters and Vapor Pressure Measurements for 1,1,1-Trifluoroethane (R-143a). In J. Chem. Eng. Data 43 (1998) pp. 55-59, doi : 10.1021 / je970177h .

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Entry for CAS no. 420-46-2 in the GESTIS substance database of the IFA , accessed on April 22, 2016(JavaScript required) .

[2] G. Myhre, D. Shindell et al .: Climate Change 2013: The Physical Science Basis . Working Group I contribution to the IPCC Fifth Assessment Report. Ed .: Intergovernmental Panel on Climate Change . 2013, Chapter 8: Anthropogenic and Natural Radiative Forcing, pp. 24-39; Table 8.SM.16 ( PDF ).

[Sorbe-3] G. Sorbe: Safety characteristics of chemical substances. - 82nd supplementary delivery 6/2001, ecomed Verlag Heidelberg, ISBN 3-609-73060-9 .

[Russell-4] H. Russell Jr., DRV Golding, DM Yost: The heat capacity, heats of transition, fusion and vaporization, vapor pressure and entropy of 1,1,1-trifluoroethane. In: J. Am. Chem. Soc. 66 (1944) pp. 16-20. doi : 10.1021 / ja01229a006 .

[Wu-5] E. Wu, AS Rodgers: Thermochemistry of gas-phase equilibrium CF3CH3 + I2 = CF3CH2I + HI. The carbon-hydrogen bond dissociation energy in 1,1,1-trifluoroethane and the heat of formation of the 2,2,2-trifluoroethyl radical. in J. Phys. Chem. , 1974, 78, pp. 2315-2317.

[Kolesov-6] VP Kolesov, AM Martynov, SM Skuratov: Standard enthalpy of formation of 1,1,1-trifluoroethane. In: Russ. J. Phys. Chem. (Engl. Transl.) 39 (1965) 39, pp. 223-225.

[Golding-7] A ^b H. Russell Jr., DRV Golding, DM Yost: The heat capacity, heats of transition, fusion and vaporization, vapor pressure and entropy of 1,1,1-trifluoroethane. In: J. Am. Chem. Soc. 1944, 66, pp. 16-20.

[Fujiwara-8] K. Fujiwara, S. Nakamura, M. Noguchi: Critical Parameters and Vapor Pressure Measurements for 1,1,1-Trifluoroethane (R-143a). In J. Chem. Eng. Data 43 (1998) pp. 55-59, doi : 10.1021 / je970177h .