# barium oxide, obtained by calcining witherite

**Formula:**BaO**Molecular weight:**153.326**IUPAC Standard InChI:**- InChI=1S/Ba.O
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**IUPAC Standard InChIKey:**QVQLCTNNEUAWMS-UHFFFAOYSA-N**CAS Registry Number:**1304-28-5**Chemical structure:**

This structure is also available as a 2d Mol file**Other names:**barium oxide; Barium monoxide-
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## Gas phase thermochemistry data

**Go To:** Top, Condensed phase thermochemistry data, 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 |
---|---|---|---|---|---|

_{f}H°_{gas} | -29.601 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1974 |

Quantity | Value | Units | Method | Reference | Comment |

S°_{gas,1 bar} | 56.274 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1974 |

### Gas Phase Heat Capacity (Shomate Equation)

C_{p}° = A + B*t + C*t^{2} + D*t^{3} +
E/t^{2}

H° − H°_{298.15}= A*t + B*t^{2}/2 +
C*t^{3}/3 + D*t^{4}/4 − E/t + F − H

S° = A*ln(t) + B*t + C*t^{2}/2 + D*t^{3}/3 −
E/(2*t^{2}) + 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) | 5000. - 6000. |
---|---|

A | -299.0511 |

B | 121.1577 |

C | -16.48234 |

D | 0.763597 |

E | 694.5268 |

F | 710.3179 |

G | 147.2483 |

H | -29.59990 |

Reference | Chase, 1998 |

Comment | Data last reviewed in June, 1974 |

## Condensed phase thermochemistry data

**Go To:** Top, Gas phase thermochemistry data, 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 |
---|---|---|---|---|---|

_{f}H°_{liquid} | -117.50 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1974 |

Quantity | Value | Units | Method | Reference | Comment |

S°_{liquid,1 bar} | 23.07 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1974 |

Quantity | Value | Units | Method | Reference | Comment |

_{f}H°_{solid} | -131.00 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1974 |

Quantity | Value | Units | Method | Reference | Comment |

S°_{solid} | 17.22 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1974 |

### Liquid Phase Heat Capacity (Shomate Equation)

C_{p}° = A + B*t + C*t^{2} + D*t^{3} +
E/t^{2}

H° − H°_{298.15}= A*t + B*t^{2}/2 +
C*t^{3}/3 + D*t^{4}/4 − E/t + F − H

S° = A*ln(t) + B*t + C*t^{2}/2 + D*t^{3}/3 −
E/(2*t^{2}) + G

C_{p} = heat capacity (cal/mol*K)

H° = standard enthalpy (kcal/mol)

S° = standard entropy (cal/mol*K)

t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

Temperature (K) | 2286. - 5000. |
---|---|

A | 16.00000 |

B | 4.686783×10^{-7} |

C | -7.889604×10^{-8} |

D | 3.500001×10^{-9} |

E | 8.576028×10^{-7} |

F | -125.6353 |

G | 37.35947 |

H | -117.5017 |

Reference | Chase, 1998 |

Comment | Data last reviewed in June, 1974 |

### Solid Phase Heat Capacity (Shomate Equation)

C_{p}° = A + B*t + C*t^{2} + D*t^{3} +
E/t^{2}

H° − H°_{298.15}= A*t + B*t^{2}/2 +
C*t^{3}/3 + D*t^{4}/4 − E/t + F − H

S° = A*ln(t) + B*t + C*t^{2}/2 + D*t^{3}/3 −
E/(2*t^{2}) + G

C_{p} = heat capacity (cal/mol*K)

H° = standard enthalpy (kcal/mol)

S° = standard entropy (cal/mol*K)

t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

Temperature (K) | 298. - 2286. |
---|---|

A | 11.33540 |

B | 3.139628 |

C | -0.907385 |

D | 0.173503 |

E | -0.080487 |

F | -134.7827 |

G | 29.58700 |

H | -131.0000 |

Reference | Chase, 1998 |

Comment | Data last reviewed in June, 1974 |

## References

**Go To:** Top, Gas phase thermochemistry data, 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, Gas phase thermochemistry data, Condensed phase thermochemistry data, 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) S° _{solid}Entropy of solid at standard conditions _{f}H°_{gas}Enthalpy of formation of gas at standard conditions _{f}H°_{liquid}Enthalpy of formation of liquid at standard conditions _{f}H°_{solid}Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69:
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