Gourt Home::Gourt :: Ammonia (data page)
This page provides supplementary chemical data on ammonia.
Structure and properties
| Molecular structure | |
|---|---|
| Point group | C3v |
| Bond length | 101.7 pm (N–H) |
| Bond angle | 107.8° (H–N–H) |
| Bond strength | 435 kJ/mol (H–NH2) |
| Crystal data | |
| Crystal structure | ? |
| Properties | |
| Dipole moment | 1.46 D |
| Dielectric constant | 22 ε0 at 239 K |
| Magnetic susceptibility | diamagnetic |
Thermodynamic properties
| Phase behavior | |
|---|---|
| Triple point | 195.4 K (-77.75 °C), 6.060 kPa |
| Critical point | 405.5 K (132.3 °C), 113.00 bar |
| Std enthalpy change of fusion, ΔfusH | ? kJ/mol |
| Std entropy change of fusion, ΔfusS | ? J/(mol·K) |
| Std enthalpy change of vaporization, ΔvapH | +23.35 kJ/mol |
| Std entropy change of vaporization, ΔvapS | ? J/(mol·K) |
| Solid properties | |
| Std enthalpy change of formation, ΔfH | ? kJ/mol |
| Standard molar entropy, S | ? J/(mol K) |
| Heat capacity, cp | ? J/(mol K) |
| Liquid properties | |
| Std enthalpy change of formation, ΔfH | ? kJ/mol |
| Standard molar entropy, S | ? J/(mol K) |
| Heat capacity, cp | ? J/(mol K) |
| Gas properties | |
| Std enthalpy change of formation, ΔfH | −45.92 kJ/mol |
| Standard molar entropy, S | 192.77 J/(mol K) |
| Heat capacity, cp | 35.06 J/(mol K) |
Spectral data
| UV-Vis | |
|---|---|
| λmax | None nm |
| Extinction coefficient, ε | None |
| IR | |
| Major absorption bands | 3444, 3337, 1627, 950 cm−1 |
| NMR | |
| Proton NMR | |
| Carbon-13 NMR | None - no carbons |
| Other NMR data | |
| MS | |
| Masses of main fragments | 17 (100%) 16(80%) 15(9%) |
Regulatory data
| Regulatory data | |
|---|---|
| EINECS number | 231-635-3 (gas) 215-647-6 (soln.) |
| EU index number | 007-001-00-5 (gas) 007-001-01-2 (soln.) |
| PEL-TWA (OSHA) | 50 ppm (35 mg/m3) |
| IDLH (NIOSH) | 300 ppm |
| Flash point | 11 °C |
| Autoignition temperature | 651 °C |
| Explosive limits | 15–28% |
| RTECS number | BO0875000 |
Material Safety Data Sheet
The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions.
References
Except where noted otherwise, data relate to standard ambient temperature and pressure.
Chemical infobox applies.
External links
- IR spectrum (from NIST)
"Ammonia (data page)"