What is the partial pressure of H2S at 25 deg C?
Answers
Answer:
Hydrogen sulfide, H2S, is a highly toxic and flammable, colorless gas with a characteristic odor of rotten eggs. It is used in the manufacture of chemicals, in metallurgy, and as an analytical reagent. It is heavier than air and tends to accumulate at the bottom of poorly ventilated spaces. Although very pungent at first, it quickly deadens the sense of smell.
Hydrogen sulfide occurs naturally in crude petroleum, natural gas, volcanic gases, and hot springs. It can also result from bacterial breakdown of organic matter. It is also produced by human and animal wastes.
Hydrogen sulfide is used in the manufacture of chemicals, in metallurgy, and as an analytical reagent.
The phase diagram of hydrogen sulfide is shown below the table.
Chemical, physical and thermal properties of hydrogen sulfide:
Values are given for gas phase at 25oC /77oF / 298 K and 1 bara, if not other phase, temperature or pressure given.
For full table with Imperial Units - rotate the screen!
Property Value Unit Value Unit
Autoignition temperature 505 K 232 °C
Boiling Point 213.6 K -59.55 °C
Critical density 10.2 mol/dm3 348 kg/m3
Critical pressure 8.97 MPa=MN/m2 89.7 bar
Critical temperature 373.3 K 100.2 °C
Critical volume 98 cm3/mol 0.00288 m3/kg
Density (gas) 44.16 mol/m3 1.505 kg/m3
Density (liquid) at -121.9 °F/-85.5°C 29116 mol/m3 992.3 kg/m3
Density (liquid) at -76 °F/-60°C 26877 mol/m3 916.0 kg/m3
Flammable, gas and liquid yes
Flash point 480 K 207 °C
Gas constant, individual - R 244.0 J/kg K 0.06777 Wh/(kg K)
Gibbs free energy of formation (gas) -34 kJ/mol -998 kJ/kg
Heat (enthalpy) of formation (gas) -20.6 kJ/mol -604 kJ/kg
Heat (enthalpy) of sublimation,at -145°F/-98°C 25.4 kJ/mol 745 kJ/kg
Heat (enthalpy) of evaporation at-100°F/-73°C 20.00 kJ/mol 353.4 kJ/kg
Heat capacity, Cp (gas) 34.6 J/mol K 1.01 kJ/kg K
Specific heat capacity, Cp (liquid) at 20 bara 76.5 J/mol K 2.24 kJ/kg K
Specific heat capacity, Cv (gas) 26.0 J/mol K 0.76 kJ/kg K
Specific heat capacity, Cv (liquid) at 20 bara 37.0 J/mol K 1.09 kJ/kg K
Ionization potential 10.46 eV
Melting point 187.66 K -85.5 °C
Molecular Weight 34.081 g/mol
Solubility in water, at 25°C 4 mg/ml
Sound velocity in gas 309 m/s
Sound velocity in liquid at 20 bara 836 m/s
Specific Gravity (gas) (relativ to air) 1.19
Specific Gravity (liquid) (relativ to water) 0.92
Specific Heat Ratio (gas) - CP/CV 1.33
Specific Heat Ratio (liquid) - CP/CV at 20 bara 2.07
Specific Volume (gas) 0.023 m3/mol 0.66 m3/kg
Specific Volume (liquid) at -121.9 °F/-85.5°C 0.0000343 m3/mol 0.00101 m3/kg
Standard molar entropy, S° (gas) 206 J/mol K 6.04 kJ/kg K
Surface tension at 257°F/125°C 58.1 dynes/cm 0.0581 N/m
Thermal Conductivity 0.018 W/m °C 0.010400 Btu/hr ft °F
Triple point pressure 0.0233 MPa=MN/m2 0.233 bar
Triple point temperature 187.63 K -85.5 °C
Vapor (saturation) pressure 2.0262 MPa=MN/m2 15200.0 mm Hg
Viscosity, dynamic (absolute) 0.013 cP 8.6 [lbm/ft s*10-6]
Viscosity, kinematic 8.505 cSt 91.5 [ft2/s*10-6]
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