Acetonitrile (data page)

This page provides supplementary chemical data on acetonitrile.

Phase behavior
Triple point^[3]	229.32 K (−43.83 °C), 167 Pa
Critical point	545 K (272 °C), 4.87 MPa
Std enthalpy change of fusion, Δ_fusH^o	8.167 kJ/mol (crystal I → liq)
Std entropy change of fusion, Δ_fusS^o	35.61 J/(mol·K) (crystal I → liq)
Std enthalpy change of vaporization, Δ_vapH^o	33.225 kJ/mol at 25 °C 29.75 at 81.6 °C (BP)
Std entropy change of vaporization, Δ_vapS^o	111.44 J/(mol·K) at 25 °C
Solid properties
Std enthalpy change of formation, Δ_fH^o_solid	? kJ/mol at 25 °C
Standard molar entropy, S^o_solid	? J/(mol K)
Heat capacity, c_p	92.36 J/(mol K)at 298.15 K
Std enthalpy change of state transition, Δ_trsH^o	0.8979 kJ/mol at −56.2 °C (crystal II → crystal I)
Std entropy change of state transition, Δ_trsS^o	4.14 J/(mol·K) at −56.2 °C (crystal II → crystal I)
Liquid properties
Std enthalpy change of formation, Δ_fH^o_liquid	−40.56 kJ/mol
Standard molar entropy, S^o_liquid	149.62 J/(mol K)
Enthalpy of combustion, Δ_cH^o	−1256.33 kJ/mol
Heat capacity, c_p	91.7 J/(mol K) at 25 °C
Gas properties
Std enthalpy change of formation, Δ_fH^o_gas	−74.04 kJ/mol
Standard molar entropy, S^o_gas	? J/(mol K)
Heat capacity, c_p	? J/(mol K)

P in mm Hg		1	10	40	100	400	760
T in °C		−47.0_(s)	−16.3	7.7	27.0	62.5	81.8

Material Safety Data Sheet