Dioxosilane
- Formula: O2Si
- Molecular weight: 60.0843
- IUPAC Standard InChIKey: VYPSYNLAJGMNEJ-UHFFFAOYSA-N
- CAS Registry Number: 7631-86-9
- 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: Amorphous silica; Hydrolyzed silica (cab-o-sil); Crystalline silica; Silicon dioxide; Silica; Silicon(iv) oxide
- Information on this page:
- Other data available:
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Gas phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -305.43 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1967 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 228.98 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1967 |
Gas Phase Heat Capacity (Shomate Equation)
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) | 4500. to 6000. |
---|---|
A | 61.55710 |
B | 0.446596 |
C | -0.090267 |
D | 0.006247 |
E | -3.664591 |
F | -333.4418 |
G | 289.4972 |
H | -305.4324 |
Reference | Chase, 1998 |
Comment | Data last reviewed in June, 1967 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, IR Spectrum, THz IR spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°liquid | -902.66 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1967 |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid,1 bar | 47.92 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1967 |
Liquid Phase Heat Capacity (Shomate Equation)
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) | 1996. to 4500. |
---|---|
A | 85.77200 |
B | -0.000016 |
C | 0.000004 |
D | -3.809081×10-7 |
E | -0.000017 |
F | -952.8700 |
G | 113.3440 |
H | -902.6610 |
Reference | Chase, 1998 |
Comment | Data last reviewed in June, 1967 |
Phase change data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
2005. to 2500. | 7.82064 | 20008.568 | 58.883 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
IR Spectrum
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, THz IR spectrum, References, Notes
Data compiled by: Coblentz Society, Inc.
- Not specified, most likely a prism, grating, or hybrid spectrometer.; (NO SPECTRUM, ONLY SCANNED IMAGE IS AVAILABLE)
- SOLID (0.5 mg / 300 mg CsI DISC); BECKMAN IR-12 (GRATING); DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS)
4, 4 cm-1 resolution - SOLID (0.5 mg / 300 mg CsI PELLET); Not specified, most likely a grating spectrometer.; DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 4 cm-1 resolution
- SOLID (MULL) $$ SEE 4662 FOR KBr DISC; PERKIN-ELMER 521 (GRATING); 2 cm-1 resolution
THz IR spectrum
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Edwin J. Heilweil and Matthew B. Campbell
Condensed Phase Spectrum
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Additional Data
View image of digitized spectrum (can be printed in landscape orientation).
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Owner | Collection (C) 2005 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
State | Solid (powder) |
Sample description | 8.9 mg + 112.7 mg polyethylene spectrograde powder |
Sample contents | silica, fumed |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, THz IR spectrum, 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]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, IR Spectrum, THz IR spectrum, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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