Solid phase
Official name
Ammonia ice
Secondary names
NH3 ice
Type
Family
molecular solid
Class
polar molecular solid
Compound type
inorganic molecular solid
Chemical composition
Formula
$NH_3$
Chemical formula
NH3
Elemental formula
N H3
Isotope mixture type
terrestrial abundance
2.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$NH_3$ Ammonia molecule 1 1.0 1.0 pure main
Chemical bonds
  Bond Number
$>N-H$ 3
Class
molecular solids with polar molecules (02)
Type
with polyatomic inorganic polar molecules (02.02)
Phase name
cubic NH3 ice
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
tetartoidal
Crystal class symbol
23 (T)
Crystal spacegroup
P2(1)3
Molar mass
17.0305 $g/mol$
Density
0.817 (193 K) $g/cm^3$
State NTP
gas
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid 195.42 K
triple point solid-liquid-gas liquid phase, gas phase 195.4 K (6.060 kPa)
Refraction index $n_{\alpha}$
1.333
Pure color
colorless
Diaphaneity
transparent
Luster
vitreous
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