Question

H2S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H2S in water at STP is 0.195 m, calculate Henry’s law constant.

Answer 1

solubility = s = H * p
               = henry's constant * partial pressure of the gas above the solution
     => H = 0.195 moles / 1 atm

   this is the Henry's law constant for solubility of H2 S in water at STP.