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Name Arsenic trihydride
Chemical formula AsH3
Appearance Colourless gas


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


ΔfH0gas 66 kJ/mol
ΔfH0liquid 64 kJ/mol
ΔfH0solid ? kJ/mol
S0gas, 1 bar 223 J/mol·K


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 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.