H2s a toxic gas with rotten egg like smell

Asked by admin @ in Chemistry viewed by 289 People

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.

Answered by admin @


given, Molality =0.195 m,

 Let take mass of solvent (water)
= 1 kg 

Use above formula we get


Moles of solute = 0.195 mol


Molar mass of water (H2O
) = 2 × 1 + 16 = 18 


Mass of water (mass of solvent 1
kg = 1000 g

Number of moles of water = 1000
g / 18 = 55.56 mol


 Use above formula we get

 Mole fraction of H2S
= 0.195/(0.195 + 55.56) = 0.0035

At STP, pressure (p) = 0.987 bar always


According to Henry’s law:


p = KH × X


KH
 = 
p / X   = 0.987 / 0.0035 = 282 bar






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