Tantalum dioxide

Formula: O₂Ta
Molecular weight: 212.9467
IUPAC Standard InChI: InChI=1S/2O.Ta/q2*-2;+4
IUPAC Standard InChIKey: DPWBZNOQZSTFQV-UHFFFAOYSA-N
CAS Registry Number: 12036-14-5
Chemical structure:
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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	7.802912	14.66410
B	13.84110	-0.904698
C	-11.91960	0.335477
D	3.633901	-0.028129
E	-0.040420	-0.741735
F	-50.97949	-54.34001
G	72.57980	82.06671
H	-48.00000	-48.00000
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in December, 1973	Data last reviewed in December, 1973

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.	10.51	66.99	66.99	-0.00
300.	10.53	67.06	67.00	0.02
400.	11.41	70.22	67.42	1.12
500.	12.04	72.83	68.25	2.29
600.	12.49	75.07	69.20	3.52
700.	12.82	77.02	70.18	4.79
800.	13.04	78.75	71.15	6.08
900.	13.20	80.30	72.08	7.39
1000.	13.32	81.69	72.97	8.72
1100.	13.41	82.97	73.82	10.06
1200.	13.50	84.14	74.64	11.40

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.	13.50	84.14	74.64	11.40
1300.	13.55	85.22	75.41	12.76
1400.	13.60	86.23	76.15	14.11
1500.	13.64	87.17	76.85	15.47
1600.	13.67	88.05	77.52	16.84
1700.	13.70	88.88	78.17	18.21
1800.	13.73	89.66	78.78	19.58
1900.	13.76	90.40	79.38	20.95
2000.	13.79	91.11	79.94	22.33
2100.	13.81	91.78	80.49	23.71
2200.	13.84	92.43	81.02	25.09
2300.	13.88	93.04	81.53	26.48
2400.	13.91	93.63	82.02	27.87
2500.	13.94	94.20	82.50	29.26
2600.	13.98	94.75	82.96	30.66
2700.	14.01	95.28	83.41	32.06
2800.	14.05	95.79	83.84	33.46
2900.	14.09	96.28	84.26	34.87
3000.	14.13	96.76	84.67	36.28
3100.	14.17	97.22	85.07	37.69
3200.	14.21	97.67	85.45	39.11
3300.	14.25	98.11	85.83	40.53
3400.	14.30	98.54	86.20	41.96
3500.	14.34	98.95	86.56	43.39
3600.	14.39	99.36	86.91	44.83
3700.	14.43	99.75	87.25	46.27
3800.	14.48	100.1	87.58	47.72
3900.	14.52	100.5	87.91	49.17
4000.	14.57	100.9	88.23	50.62
4100.	14.61	101.2	88.54	52.08
4200.	14.66	101.6	88.85	53.54
4300.	14.70	101.9	89.15	55.01
4400.	14.74	102.3	89.44	56.48
4500.	14.79	102.6	89.73	57.96
4600.	14.83	102.9	90.02	59.44
4700.	14.87	103.3	90.29	60.93
4800.	14.91	103.6	90.57	62.41
4900.	14.95	103.9	90.84	63.91
5000.	14.98	104.2	91.10	65.40
5100.	15.02	104.5	91.36	66.90
5200.	15.05	104.8	91.61	68.41
5300.	15.08	105.1	91.87	69.91
5400.	15.11	105.3	92.11	71.42
5500.	15.13	105.6	92.36	72.93
5600.	15.15	105.9	92.59	74.45
5700.	15.17	106.2	92.83	75.96
5800.	15.19	106.4	93.06	77.48
5900.	15.21	106.7	93.29	79.00
6000.	15.22	106.9	93.52	80.52

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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