disodium tetraborate, anhydrous
- Formula: B4Na2O7
- Molecular weight: 201.219
- IUPAC Standard InChI: InChI=1S/B4O7.2Na/c5-1-9-3(7)11-4(8)10-2-6;;/q-2;2*+1
- IUPAC Standard InChIKey: RPAYJVFLNVKVRS-UHFFFAOYSA-N
- CAS Registry Number: 1330-43-4
- 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. - Other names: Sodium borate
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Condensed phase thermochemistry data
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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -3256.66 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 198.77 | J/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -3276.75 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 189.53 | J/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1965 |
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) | 1015.6 - 3000. |
|---|---|
| A | 444.8847 |
| B | -2.399395×10-7 |
| C | 1.082614×10-7 |
| D | -1.624874×10-8 |
| E | -3.448900×10-8 |
| F | -3476.469 |
| G | 550.8780 |
| H | -3256.662 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1965 |
Solid 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) | 298. - 1015.6 |
|---|---|
| A | 177.7317 |
| B | 150.7792 |
| C | -59.95295 |
| D | 13.70561 |
| E | -2.725467 |
| F | -3345.091 |
| G | 346.8699 |
| H | -3276.746 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1965 |
References
Go To: Top, Condensed phase thermochemistry data, 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, Condensed phase thermochemistry data, References
- Symbols used in this document:
S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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