Hydrogen sulfide boiling point

Sulfur Compounds. All crude oils contain sulfur in one of several forms including elemental sulfur, hydrogen sulfide, carbonyl sulfide (COS), and in aliphatic and aromatic compounds. The amount of sulfur-containing compounds increases progressively with an increase in the boiling point of the fraction. A majority of these compounds have one sulfur atom per molecule, but certain aromatic and polynuclear aromatic molecules found in low concentrations in crude oil contain two and even three sulfur atoms. Identification of the individual sulfur compounds in the heavy fractions poses a considerable challenge to the analytical chemist. 

When the enthalpy of vaporization of water is divided by its boiling point (on the Kelvin scale), the result is 110 J K I mol 1. For hydrogen sulfide, the same calculation gives 88 J K-1mol-1. Explain why the value for water is greater than that for hydrogen sulfide. 

Hydrogen sulfide is a poisonous gas of density 0.96, melting point — 82.9°C., boiling point — 59.4°C., critical temperature 100.5°C., critical pressure 89 atm., surface tension 25.43 dynes, specific conductance 0.2 X 10-9, dielectric constant 8.6, and viscosity 0.0041 dyne per centimeter. 

Phosphorus(V) sulfochloride is a colorless, fuming liquid with boiling point 125° and specific gravity 1.635. The alpha form solidifies at —40.8°, while the beta form solidifies at —36.2°.7 The compound hydrolyzes slowly in water and rapidly in alkaline solution. In water, the hydrolysis products are orthophosphoric acid, hydrochloric acid, and hydrogen sulfide. Phosphorus (Y) sulfochloride is soluble in benzene, carbon tetrachloride, carbon disulfide, and chloroform. It reacts with ethanol, yielding O-ethyl dichlorothiophosphate8 (synthesis 25). 

Many physical properties of covalent molecular solids are due to intermolecular forces. The melting and boiling points of molecular substances are relatively low compared with those of ionic substances. That s why salt doesn t melt when you heat it but sugar does. Many molecular substances exist as gases or vaporize readily at room temperature. Oxygen (O2), carbon dioxide (CO2), and hydrogen sulfide (H2S) are examples of covalent gases. Hardness is also due to the intermolecular forces between individual molecules, so covalent molecules form relatively soft solids. Paraffin is a common example of a covalent solid. 

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