Ammonia

CAS RN: 7664-41-7

Other Properties

Density of liquid: 0.6818 at -33.35 deg C, 1 atm; 0.6585 at -15 deg C, 2.332 atm; 0.6386 at 0 deg C, 4.238 atm; 0.6175 at 15 deg C, 7.188 atm; 0.5875 at 35 deg C, 13.321 atm
Critical molar volume: 69.8 cu cm/mol
Specific heat, J/kg-K: 2097.2 at 0 deg C; 2226.2 at 100 deg C; 2105.6 at 200 deg C
Specific gravity: 0.690 at -40 deg C; 0.639 at 0 deg C; 0.580 at 40 deg C
Dipole moment, gas: 4.9x10-30 C m; 1.47 D
Heat capacity 8.38 cal/mol/deg at 25 deg C
1 ppm = 0.70 mg/cu m
Aqueous ammonia: pKb 4.767, Kb 1.710X10-5 at 20 deg C; pKb 4.751, Kb 1.774X10-5 at 25 deg C; pKb 4.740, Kb 1.820X10-5 at 30 deg C
Ionization potential = 10.070 eV
Density of aqueous solutions at 20 deg C/4 deg C: 0.9939 (1%), 0.9811 (4%), 0.9651 (8%), 0.9362 (16%), 0.9229 (20%), 0.9101 (24%), 0.8980 (28%)
Density: 0.7710 g/L (gas); 0.89801 g/L at 20 deg C (28% aqueous solution)
Lighter than air; easily liquified by pressure; spacial volume: 22.7 cu ft at 70 deg C
Mixtures of ammonia and air will explode when ignited under favorable conditions, but ammonia is generally regarded as nonflammable; solution of ammonia in water is exothermic; one liter of gas weighs 0.7714 g
Freezing point of aqueous solutions, deg C: -2.9 (4%), -8.1 (8%), -23.1 (16%), -34.9 (20%), -44.5 (24%), -69.2 (28%)
Heat of formation: -45.9 kJ/mol; Gibbs energy of formation: -16.4 kJ/mol; molar entropy: 192.8 J/mol-K; molar heat capacity at constant pressure: 35.1 J/mol-K at 298.15 K
Vapor pressure: 1 Pa at -139 deg C, 10 Pa at -127 deg C, 100 Pa at -112 deg C; 1 kPa at -94.5 deg C (solids); 10 kPa at -71.3 deg C, 100 kPa at -33.6 deg C (liquid)
Henry's Law constant = 1.61X10-5 atm cu-m/mole at 25 deg C
Hydroxyl radical reaction rate constant = 1.60X10-13 cu m/molec-sec at 25 deg C
Find more information on this substance at: PubChem, PubMed