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I.e'0.195 mol of H2S is dissolved in 1000g
moles of water =1000 g/ 18 g mol-1
              =55.56 mol
mole fraction of H2S,x =moles of H2S/moles of H2S + moles of water
                                           =0.195/0.195 +55.56 =0.0035
At STP ,pressure {p] =0.987 bar 
According to Henry's law;
   Kh =p/x
    0.987/0.0035 bar 
                              = 282 bar

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