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
The 3d structure may be viewed using Java or Javascript. - Species with the same structure:
- Other names: alpha-quartz; Silicon oxide
- Information on this page:
- 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 (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 847. | 847. to 1996. |
|---|---|---|
| A | -6.076591 | 58.75340 |
| B | 251.6755 | 10.27925 |
| C | -324.7964 | -0.131384 |
| D | 168.5604 | 0.025210 |
| E | 0.002548 | 0.025601 |
| F | -917.6893 | -929.3292 |
| G | -27.96962 | 105.8092 |
| H | -910.8568 | -910.8568 |
| 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 (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 298. | 44.57 | 41.44 | 41.47 | -0.01 |
| 300. | 44.77 | 41.74 | 41.47 | 0.08 |
| 400. | 53.43 | 55.87 | 43.34 | 5.01 |
| 500. | 59.64 | 68.50 | 47.13 | 10.68 |
| 600. | 64.42 | 79.81 | 51.65 | 16.89 |
| 700. | 68.77 | 90.06 | 56.42 | 23.55 |
| 800. | 73.70 | 99.56 | 61.22 | 30.67 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 847. | 67.42 | 104.7 | 63.47 | 34.93 |
| 900. | 67.95 | 108.8 | 66.02 | 38.51 |
| 1000. | 68.95 | 116.0 | 70.66 | 45.36 |
| 1100. | 69.96 | 122.6 | 75.09 | 52.30 |
| 1200. | 70.96 | 128.8 | 79.31 | 59.35 |
| 1300. | 71.96 | 134.5 | 83.34 | 66.50 |
| 1400. | 72.97 | 139.9 | 87.18 | 73.74 |
| 1500. | 73.97 | 144.9 | 90.87 | 81.09 |
| 1600. | 74.98 | 149.7 | 94.40 | 88.54 |
| 1700. | 75.98 | 154.3 | 97.79 | 96.08 |
| 1800. | 76.99 | 158.7 | 101.0 | 103.7 |
| 1900. | 77.99 | 162.9 | 104.2 | 111.5 |
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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