Law of comparative judgment
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This page provides supplementary chemical data on ammonia.
Structure and properties
Molecular structure | |
---|---|
Point group | C3v |
Bond length | 101.2 pm (N–H)[1] |
Bond angle | 106.7° (H–N–H)[1] |
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 |
Acidity of NH4+ (pKa) | 9.25 |
Thermodynamic properties
Phase behavior | |
---|---|
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 |
Std Gibbs free energy change of formation, ΔfG |
−16.6 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 |
Vapor-Liquid Equilibrium Data
P in mm Hg | 1 | 10 | 40 | 100 | 400 | 760 | 1520 | 3800 | 7600 | 15600 | 30400 | 45600 |
T in °C | –109.1(s) | –91.9(s) | –79.2(s) | –68.4 | –45.4 | –33.6 | –18.7 | 4.7 | 25.7 | 50.1 | 78.9 | 98.3 |
Table data (above) obtained from CRC Handbook of Chemistry and Physics 44th ed. The (s) notation indicates equilibrium temperature of vapor over solid. Otherwise temperature is equilibrium of vapor over liquid.
50 year old Petroleum Engineer Kull from Dawson Creek, spends time with interests such as house brewing, property developers in singapore condo launch and camping. Discovers the beauty in planing a trip to places around the entire world, recently only coming back from .
Vapor pressure formula for ammonia:[2]
- log10(P) = A – B / (T – C)
where P is pressure in kPa and T is temperature in Kelvin
- A = 6.67956; B = 1002.711; C = 25.215 for T = 190 K through 333 K
|
|
Heat capacity of liquid and vapor
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 # | 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 and follow its directions.
- SIRI
- Science Stuff (Ammonia Solution)
References
- ↑ 1.0 1.1 CRC Handbook of Chemistry and Physics, 94th ed. http://www.hbcpnetbase.com. Page 9-26. Retrieved 18 June 2013.
- ↑ Lange's Handbook of Chemistry, 10th ed. page 1436
- ↑ Lange's Handbook of Chemistry, 10th ed. page 1451 and 1468
- ↑ 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ Perman, Jour. Chem. Soc. 83 1168 (1903)
- ↑ 6.0 6.1 Template:Cite web
Except where noted otherwise, data relate to standard ambient temperature and pressure.
Disclaimer applies.
External links
- IR spectrum (from NIST)