Constituent
Name
C2H2 - phase II
Official name
Acetylene II ice
Family
molecular solid
Class
non polar molecular solid
Compound type
organic molecular solid
Chemical composition
Formula
C2H2
Chemical formula
C2H2
Elemental formula
C2 H2
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
C2H2 Ethyne molecule 1 1.0 1 pure main
Chemical functions
  Function Number Relevance
R≡ CH 2 main
Chemical bonds
  Bond Number Relevance
-C≡ C- 1 main
≡ C-H 2 main
Class
molecular solids with apolar molecules (01)
Type
with polyatomic organic apolar molecules (CnHm...) (01.06)
Phase name
C2H2-II
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Cmca
Molar mass
26.037 g/mol
Refringence type
biaxial
Refraction index nα
1.36
Diaphaneity
transparent
Luster
vitreous