Disodium difluoride

Formula: F₂Na₂
Molecular weight: 83.9763450
CAS Registry Number: 12285-64-2
Information on this page:
Other data available:
- Gas phase thermochemistry data
- Gas phase ion energetics data
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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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.

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Temperature (K)	298. to 6000.
A	82.10849
B	0.884435
C	-0.239745
D	0.020464
E	-1.040800
F	-874.4309
G	380.5850
H	-846.4232
Reference	Chase, 1998
Comment	Data last reviewed in December, 1968

Temperature (K)	C_p (J/mol*K)	S° (J/mol*K)	-(G° - H°_298.15)/T (J/mol*K)	H° - H°_298.15 (kJ/mol)
298.	70.63	287.3	287.3	-0.01
300.	70.79	287.8	287.3	0.13
400.	75.92	308.9	290.2	7.50
500.	78.33	326.2	295.7	15.23
600.	79.67	340.6	302.0	23.13
700.	80.49	352.9	308.4	31.15
800.	81.05	363.7	314.7	39.22
900.	81.44	373.3	320.7	47.35
1000.	81.73	381.9	326.4	55.51
1100.	81.96	389.7	331.8	63.69
1200.	82.14	396.8	336.9	71.90
1300.	82.28	403.4	341.8	80.12
1400.	82.40	409.5	346.4	88.35
1500.	82.50	415.2	350.8	96.60
1600.	82.59	420.5	355.0	104.9
1700.	82.66	425.5	359.0	113.1
1800.	82.72	430.3	362.8	121.4
1900.	82.78	434.7	366.5	129.7
2000.	82.82	439.0	370.0	137.9
2100.	82.86	443.0	373.4	146.2
2200.	82.90	446.9	376.6	154.5
2300.	82.93	450.6	379.8	162.8
2400.	82.95	454.1	382.8	171.1
2500.	82.97	457.5	385.7	179.4
2600.	82.99	460.7	388.5	187.7
2700.	83.01	463.9	391.3	196.0
2800.	83.02	466.9	393.9	204.3
2900.	83.03	469.8	396.5	212.6
3000.	83.04	472.6	399.0	220.9
3100.	83.05	475.3	401.4	229.2
3200.	83.05	478.0	403.7	237.5
3300.	83.06	480.5	406.0	245.8
3400.	83.06	483.0	408.3	254.1
3500.	83.06	485.4	410.4	262.4
3600.	83.06	487.7	412.5	270.7
3700.	83.06	490.0	414.6	279.0
3800.	83.06	492.2	416.6	287.3
3900.	83.06	494.4	418.6	295.7
4000.	83.05	496.5	420.5	304.0
4100.	83.05	498.6	422.4	312.3
4200.	83.05	500.6	424.2	320.6
4300.	83.05	502.5	426.0	328.9
4400.	83.05	504.4	427.8	337.2
4500.	83.05	506.3	429.5	345.5
4600.	83.05	508.1	431.2	353.8
4700.	83.05	509.9	432.9	362.1
4800.	83.05	511.6	434.5	370.4
4900.	83.05	513.4	436.1	378.7
5000.	83.05	515.0	437.6	387.0
5100.	83.06	516.7	439.2	395.3
5200.	83.06	518.3	440.7	403.6
5300.	83.07	519.9	442.2	411.9
5400.	83.08	521.4	443.6	420.2
5500.	83.09	522.9	445.0	428.5
5600.	83.10	524.4	446.4	436.9
5700.	83.12	525.9	447.8	445.2
5800.	83.13	527.4	449.2	453.5
5900.	83.15	528.8	450.5	461.8
6000.	83.18	530.2	451.8	470.1

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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