Dipotassium

Formula: K₂
Molecular weight: 78.1966
IUPAC Standard InChI: InChI=1S/2K
IUPAC Standard InChIKey: ZDHURYWHEBEGHO-UHFFFAOYSA-N
CAS Registry Number: 25681-80-5
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. - 1300.	1300. - 6000.
A	5.415581	7.412359
B	12.80000	-1.382941
C	-13.46240	0.276767
D	3.826100	-0.018846
E	0.083536	2.970591
F	27.77010	32.06570
G	63.45301	73.42949
H	29.56099	29.56099
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in December, 1983	Data last reviewed in December, 1983

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.	9.08	59.68	59.68	-0.00
300.	9.08	59.74	59.68	0.02
400.	9.15	62.35	60.03	0.93
500.	9.26	64.41	60.71	1.85
600.	9.31	66.10	61.47	2.78
700.	9.26	67.54	62.24	3.71
800.	9.13	68.76	62.98	4.63
900.	8.92	69.83	63.68	5.53
1000.	8.66	70.76	64.35	6.41
1100.	8.37	71.57	64.97	7.26
1200.	8.06	72.28	65.55	8.08
1300.	7.76	72.92	66.09	8.87

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)
1300.	7.80	72.92	66.09	8.88
1400.	7.48	73.48	66.60	9.64
1500.	7.22	73.99	67.07	10.37
1600.	6.99	74.45	67.52	11.08
1700.	6.80	74.87	67.94	11.77
1800.	6.63	75.25	68.34	12.44
1900.	6.48	75.60	68.71	13.10
2000.	6.35	75.93	69.06	13.74
2100.	6.23	76.24	69.40	14.37
2200.	6.12	76.53	69.72	14.99
2300.	6.03	76.80	70.02	15.59
2400.	5.94	77.05	70.31	16.19
2500.	5.87	77.29	70.58	16.78
2600.	5.80	77.52	70.84	17.37
2700.	5.73	77.74	71.09	17.94
2800.	5.68	77.95	71.34	18.51
2900.	5.62	78.14	71.57	19.08
3000.	5.58	78.33	71.79	19.64
3100.	5.53	78.52	72.00	20.19
3200.	5.49	78.69	72.21	20.74
3300.	5.46	78.86	72.41	21.29
3400.	5.43	79.02	72.60	21.84
3500.	5.40	79.18	72.79	22.38
3600.	5.37	79.33	72.97	22.92
3700.	5.35	79.48	73.14	23.45
3800.	5.33	79.62	73.31	23.98
3900.	5.31	79.76	73.47	24.52
4000.	5.29	79.89	73.63	25.05
4100.	5.27	80.02	73.79	25.57
4200.	5.26	80.15	73.94	26.10
4300.	5.25	80.27	74.08	26.63
4400.	5.23	80.39	74.22	27.15
4500.	5.22	80.51	74.36	27.67
4600.	5.21	80.63	74.50	28.19
4700.	5.20	80.74	74.63	28.72
4800.	5.20	80.85	74.76	29.24
4900.	5.19	80.95	74.88	29.75
5000.	5.18	81.06	75.00	30.27
5100.	5.17	81.16	75.12	30.79
5200.	5.16	81.26	75.24	31.31
5300.	5.16	81.36	75.36	31.82
5400.	5.15	81.46	75.47	32.34
5500.	5.14	81.55	75.58	32.85
5600.	5.13	81.64	75.69	33.37
5700.	5.12	81.73	75.79	33.88
5800.	5.11	81.82	75.89	34.39
5900.	5.10	81.91	76.00	34.90
6000.	5.09	82.00	76.09	35.41

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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