Ethyne, difluoro-

Formula: C₂F₂
Molecular weight: 62.0182
IUPAC Standard InChI: InChI=1S/C2F2/c3-1-2-4
IUPAC Standard InChIKey: BWTZYYGAOGUPFQ-UHFFFAOYSA-N
CAS Registry Number: 689-99-6
Chemical structure:
This structure is also available as a 2d Mol file
Other names: Acetylene, difluoro-; Difluoroacetylene; FC≡CF; Difluoroethyne; C2F2
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Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
C_p = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.

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Temperature (K)	298. - 1200.	1200. - 6000.
A	9.158210	20.42670
B	21.44080	0.234936
C	-15.77190	-0.046015
D	4.277971	0.003107
E	-0.058355	-1.628120
F	1.251560	-5.152570
G	63.35660	77.34369
H	5.000010	5.000010
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in December, 1967	Data last reviewed in December, 1967

Temperature (K)	C_p (cal/mol*K)	S° (cal/mol*K)	-(G° - H°_298.15)/T (cal/mol*K)	H° - H°_298.15 (kcal/mol)
298.	13.60	58.32	58.33	-0.00
300.	13.64	58.42	58.33	0.03
400.	15.12	62.55	58.89	1.47
500.	16.24	66.05	59.98	3.04
600.	17.11	69.09	61.25	4.71
700.	17.79	71.78	62.57	6.45
800.	18.32	74.19	63.87	8.26
900.	18.73	76.38	65.14	10.11
1000.	19.05	78.37	66.37	12.00
1100.	19.30	80.19	67.54	13.92
1200.	19.53	81.88	68.67	15.86

Temperature (K)	C_p (cal/mol*K)	S° (cal/mol*K)	-(G° - H°_298.15)/T (cal/mol*K)	H° - H°_298.15 (kcal/mol)
1200.	19.52	81.88	68.67	15.86
1300.	19.70	83.45	69.74	17.82
1400.	19.84	84.92	70.78	19.80
1500.	19.96	86.29	71.77	21.79
1600.	20.06	87.58	72.71	23.79
1700.	20.15	88.80	73.63	25.80
1800.	20.22	89.96	74.50	27.82
1900.	20.28	91.05	75.34	29.84
2000.	20.33	92.09	76.15	31.87
2100.	20.38	93.09	76.94	33.91
2200.	20.42	94.03	77.69	35.95
2300.	20.45	94.94	78.42	37.99
2400.	20.49	95.81	79.13	40.04
2500.	20.51	96.65	79.81	42.09
2600.	20.54	97.46	80.48	44.14
2700.	20.56	98.23	81.12	46.20
2800.	20.58	98.98	81.75	48.26
2900.	20.60	99.70	82.35	50.32
3000.	20.62	100.4	82.94	52.38
3100.	20.64	101.1	83.52	54.44
3200.	20.65	101.7	84.08	56.50
3300.	20.66	102.4	84.62	58.57
3400.	20.67	103.0	85.15	60.64
3500.	20.69	103.6	85.67	62.70
3600.	20.70	104.2	86.18	64.77
3700.	20.70	104.7	86.67	66.84
3800.	20.71	105.3	87.15	68.91
3900.	20.72	105.8	87.62	70.99
4000.	20.73	106.3	88.09	73.06
4100.	20.73	106.9	88.54	75.13
4200.	20.74	107.4	88.98	77.20
4300.	20.75	107.8	89.41	79.28
4400.	20.75	108.3	89.84	81.35
4500.	20.75	108.8	90.25	83.43
4600.	20.76	109.2	90.66	85.50
4700.	20.76	109.7	91.06	87.58
4800.	20.77	110.1	91.45	89.66
4900.	20.77	110.6	91.84	91.73
5000.	20.77	111.0	92.22	93.81
5100.	20.78	111.4	92.59	95.89
5200.	20.78	111.8	92.96	97.97
5300.	20.78	112.2	93.32	100.0
5400.	20.79	112.6	93.67	102.1
5500.	20.79	113.0	94.02	104.2
5600.	20.79	113.3	94.36	106.3
5700.	20.80	113.7	94.69	108.4
5800.	20.80	114.1	95.02	110.4
5900.	20.80	114.4	95.35	112.5
6000.	20.81	114.8	95.67	114.6

References

Go To: Top, Gas Phase Heat Capacity (Shomate Equation), Notes

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Notes

Go To: Top, Gas Phase Heat Capacity (Shomate Equation), References

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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