Properties

General
Name	Arsenic trihydride
Chemical formula	AsH3
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
ΔfH0gas	66 kJ/mol
ΔfH0liquid	64 kJ/mol
ΔfH0solid	? kJ/mol
S0gas, 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
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references

Arsine (AsH₃) is a flammable and 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.

Exposure to arsine leads to massive intravascular hemolysis and renal failure. It has a high mortality rate.

Arsine was formed temporarily, and then decomposed, in the old (but extremely sensitive) Marsh test for the presence of arsenic.