Arsine - Wikipedia

**Properties**
General
Name	Arsenic trihydride
Chemical formula	As H₃
Appearance	Colourless gas
Physical
Formula weight	78.0 amu
Melting point	157 K (-116 °C)
Boiling point	210 K (-63 °C)
Density	1.7 ×10³ kg/m³ (liquid)
Solubility	0.07 g in 100g water
Thermochemistry
Δ_fH⁰_gas	66 kJ/mol
Δ_fH⁰_liquid	64 kJ/mol
Δ_fH⁰_solid	? kJ/mol
S⁰_{gas, 1 bar}	223 J/mol·K
Safety
Ingestion	Extremely toxic, deadly. Headache is an early symptom.
Inhalation	Deadly. Smells like garlic.
Skin	Contact should be avoided.
Eyes	Contact should be avoided.
More info	Hazardous Chemical Database (http://ull.chemistry.uakron.edu/erd/chemicals/7/6080.html)
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references

Arsine (As H₃) is a highly toxic gaseous chemical compound of arsenic and hydrogen. Synonyms include arseniuretted hydrogen, arsenous hydride, arsenic trihydride, and hydrogen arsenide. Some organic compounds based on arsine, such as lewisite, adamsite[?], Clark I[?] and Clark II[?], have been developed for chemical warfare.

Arsine is also used in the semiconductor industry for depositing arsenic.