Henrys Constant H for Various Compounds in Water at

TABLE 2-124 Henry s Constant H for Various Compounds in Water at 25°C 

The H in Tables 2-123 to 2-134 is the proportionality constant in Henry s law, p = Hx, where x is the mole fraction of the solute in the aqueous liquid phase p is the partial pressure in atm of the solute in the gas phase and H is a proportionality constant, generally referred to as Henry s constant. Values of H often have considerable uncertainty and are strong functions of temperature. To convert values of H at 25°C from atm to atm/(mol/m3), divide by the molar density of water at 25°C, which is 55,342 mol/m3. Henry s law is valid only for dilute solutions. 

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