This page provides supplementary chemical data on isobutane.
Material Safety Data Sheet
The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions.
Structure and properties
Structure and properties Index of refraction, nD ? Abbe number? Dielectric constant, εr ? ε0 at ? °C Bond strength ? Bond length ? Bond angle ? Magnetic susceptibility ? Surface tension 10.3 dyn/cm at 20°C P 300 kPa
Thermodynamic properties
Phase behavior Triple point 113.55K (–159.8 °C), 0.019483 Pa Critical point 408.7 K (134.4 °C), 3655 kPa Std enthalpy changeof fusion, ΔfusHo 4.59 kJ/mol Std entropy changeof fusion, ΔfusSo 39.92 J/(mol·K) Std enthalpy changeof vaporization, ΔvapHo 21.3 kJ/mol Std entropy changeof vaporization, ΔvapSo 81.46 J/(mol·K) Solid properties Std enthalpy changeof formation, ΔfHosolid ? kJ/mol Standard molar entropy,Sosolid ? J/(mol K) Heat capacity, cp ? J/(mol K) Liquid properties Std enthalpy changeof formation, ΔfHoliquid ? kJ/mol Standard molar entropy,Soliquid 200.79 J/(mol K) Heat capacity, cp 129.70 J/(mol K) –253°C to –13°C Gas properties Std enthalpy changeof formation, ΔfHogas –134.2 kJ/mol Standard molar entropy,Sogas 249.7 J/(mol K) Enthalpy of combustion, ΔcHo –2869 kJ/mol Heat capacity, cp 95.21 J/(mol K) at 20°C van der Waals' constantsLange's Handbook of Chemistry 10th ed, pp 1522-1524 a = 1304.1 L2 kPa/mol2 b = 0.1142 liter per mole
Vapor pressure of liquid P in mm Hg 1 10 40 100 400 760 1520 3800 7600 15200 30400 45600 T in °C –109.2 –86.4 –68.4 –54.1 –27.1 –11.7 7.5 39.0 68.8 99.5 — — Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.
Spectral data
UV-Vis λmax ? nm Extinction coefficient, ε ? IR Major absorption bands ? cm−1 NMR Proton NMR Carbon-13 NMR Other NMR data MS Masses of main fragments
References