Quartz (SiO2)
- Formula: O2Si
- Molecular weight: 60.0843
- IUPAC Standard InChI: InChI=1S/O2Si/c1-3-2
- IUPAC Standard InChIKey: VYPSYNLAJGMNEJ-UHFFFAOYSA-N
- CAS Registry Number: 14808-60-7
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
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- Other names: alpha-quartz; Silicon oxide
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- Other data available:
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Solid Phase Heat Capacity (Shomate Equation)
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cp° = 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
Cp = 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 847. | 847. to 1996. |
|---|---|---|
| A | -1.452341 | 14.04240 |
| B | 60.15189 | 2.456800 |
| C | -77.62820 | -0.031401 |
| D | 40.28690 | 0.006025 |
| E | 0.000609 | 0.006119 |
| F | -219.3330 | -222.1150 |
| G | -6.684900 | 25.28901 |
| H | -217.7000 | -217.7000 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | quartz phase; Data last reviewed in June, 1967 | quartz phase; Data last reviewed in June, 1967 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 298. | 10.65 | 9.90 | 9.91 | -0.00 |
| 300. | 10.70 | 9.98 | 9.91 | 0.02 |
| 400. | 12.77 | 13.35 | 10.36 | 1.20 |
| 500. | 14.25 | 16.37 | 11.26 | 2.55 |
| 600. | 15.40 | 19.07 | 12.34 | 4.04 |
| 700. | 16.44 | 21.53 | 13.48 | 5.63 |
| 800. | 17.61 | 23.79 | 14.63 | 7.33 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 847. | 16.11 | 25.02 | 15.17 | 8.35 |
| 900. | 16.24 | 26.01 | 15.78 | 9.20 |
| 1000. | 16.48 | 27.73 | 16.89 | 10.84 |
| 1100. | 16.72 | 29.31 | 17.95 | 12.50 |
| 1200. | 16.96 | 30.78 | 18.96 | 14.18 |
| 1300. | 17.20 | 32.14 | 19.92 | 15.89 |
| 1400. | 17.44 | 33.43 | 20.84 | 17.62 |
| 1500. | 17.68 | 34.64 | 21.72 | 19.38 |
| 1600. | 17.92 | 35.79 | 22.56 | 21.16 |
| 1700. | 18.16 | 36.88 | 23.37 | 22.96 |
| 1800. | 18.40 | 37.93 | 24.15 | 24.79 |
| 1900. | 18.64 | 38.93 | 24.90 | 26.64 |
References
Go To: Top, Solid Phase Heat Capacity (Shomate Equation), Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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, Solid Phase Heat Capacity (Shomate Equation), References
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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