Ammonia (data page)
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This page provides supplementary chemical data on ammonia.
Contents |
[edit] Structure and properties
Molecular structure | |
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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 |
[edit] Thermodynamic properties
Phase behavior | |
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Triple point | 195.4 K (–77.75 °C), 6.060 kPa |
Critical point | 405.5 K (132.3 °C), 11.300 MPa |
Std enthalpy change of fusion, ΔfusH |
+5.653 kJ/mol |
Std entropy change of fusion, ΔfusS |
+28.93 J/(mol·K) |
Std enthalpy change of vaporization, ΔvapH |
+23.35 kJ/mol at BP of –33.4 °C |
Std entropy change of vaporization, ΔvapS |
+97.41 J/(mol·K) at BP of –33.4 °C |
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 | 80.80 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) |
Heat capacity ratio, γ at 15°C |
1.310 |
van der Waals' constants | a = 422.5 liter2 kPa / mole2 b = 0.03707 liter / mole |
[edit] Vapor-Liquid Equilibrium Data
Vapor pressure formula for ammonia:[1]
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-
- log10(P) = A – B / (T – C)
-
where P is pressure in kPa and T is temperature in Kelvins
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- A = 6.67956; B = 1002.711; C = 25.215 for T = 190 K through 333 K
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[edit] Spectral data
UV-Vis | |
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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%) |
[edit] Regulatory data
Regulatory data | |
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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 |
[edit] 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.
[edit] References
- ^ Lange's Handbook of Chemistry, 10th ed. page 1436
- ^ Lange's Handbook of Chemistry, 10th ed. page 1451 and 1468
- ^ Perman, Jour. Chem. Soc. 83 1168 (1903)
Except where noted otherwise, data relate to standard ambient temperature and pressure.
Disclaimer applies.
[edit] External links
- IR spectrum (from NIST)