Cyclic octaatomic sulfur

Formula: S₈
Molecular weight: 256.520
IUPAC Standard InChI: InChI=1S/S8/c1-2-4-6-8-7-5-3-1
IUPAC Standard InChIKey: JLQNHALFVCURHW-UHFFFAOYSA-N
CAS Registry Number: 10544-50-0
Chemical structure:
This structure is also available as a 2d Mol file
Other names: Sulfur (S8); Sulfur octamer; Sulfur, mol. (S8); Cyclooctasulfur; Octathiocane; Orthorhombic sulfur; Sulfur molecule (S8); S8; Cyclooctasulphur; Octasulfur; 115725-44-5; Sulfur
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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. to 6000.
A	43.18110
B	0.458649
C	-0.124314
D	0.010610
E	-0.542580
F	-14.71330
G	151.9000
H	0.000000
Reference	Chase, 1998
Comment	Data last reviewed in September, 1977

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.	37.20	102.8	102.8	-0.01
300.	37.28	103.1	102.8	0.07
400.	39.95	114.2	104.3	3.95
500.	41.21	123.3	107.2	8.01
600.	41.91	130.8	110.6	12.17
700.	42.34	137.3	113.9	16.39
800.	42.63	143.0	117.2	20.64
900.	42.83	148.1	120.4	24.91
1000.	42.98	152.6	123.4	29.20
1100.	43.10	156.7	126.2	33.51
1200.	43.19	160.4	128.9	37.82
1300.	43.27	163.9	131.5	42.14
1400.	43.33	167.1	133.9	46.47
1500.	43.38	170.1	136.2	50.81
1600.	43.43	172.9	138.4	55.15
1700.	43.47	175.5	140.5	59.50
1800.	43.50	178.0	142.5	63.84
1900.	43.53	180.4	144.5	68.19
2000.	43.55	182.6	146.3	72.55
2100.	43.57	184.7	148.1	76.90
2200.	43.59	186.7	149.8	81.26
2300.	43.60	188.7	151.5	85.62
2400.	43.62	190.5	153.0	89.98
2500.	43.63	192.3	154.6	94.35
2600.	43.64	194.0	156.1	98.71
2700.	43.65	195.7	157.5	103.1
2800.	43.65	197.3	158.9	107.4
2900.	43.66	198.8	160.2	111.8
3000.	43.66	200.3	161.6	116.2
3100.	43.67	201.7	162.8	120.5
3200.	43.67	203.1	164.1	124.9
3300.	43.67	204.4	165.3	129.3
3400.	43.67	205.7	166.4	133.6
3500.	43.67	207.0	167.6	138.0
3600.	43.67	208.2	168.7	142.4
3700.	43.67	209.4	169.8	146.7
3800.	43.67	210.6	170.8	151.1
3900.	43.67	211.7	171.9	155.5
4000.	43.67	212.8	172.9	159.8
4100.	43.67	213.9	173.9	164.2
4200.	43.67	215.0	174.8	168.6
4300.	43.67	216.0	175.8	172.9
4400.	43.67	217.0	176.7	177.3
4500.	43.67	218.0	177.6	181.7
4600.	43.67	218.9	178.5	186.0
4700.	43.67	219.9	179.4	190.4
4800.	43.67	220.8	180.2	194.8
4900.	43.67	221.7	181.1	199.1
5000.	43.67	222.6	181.9	203.5
5100.	43.67	223.5	182.7	207.9
5200.	43.68	224.3	183.5	212.2
5300.	43.68	225.1	184.3	216.6
5400.	43.68	226.0	185.0	221.0
5500.	43.69	226.8	185.8	225.4
5600.	43.70	227.5	186.5	229.7
5700.	43.70	228.3	187.2	234.1
5800.	43.71	229.1	188.0	238.5
5900.	43.72	229.8	188.7	242.8
6000.	43.73	230.6	189.4	247.2

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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