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H(2)S, a toxic gas with rotten egg like ...

`H_(2)S`, a toxic gas with rotten egg like smell, is used for the qualitative analysis.If the solubility of `H_(2)S` in water at `STP` is `0.195 m`, calculate Henry's law constant.

A

0.0263 bar

B

69.16 bar

C

192 bar

D

282 bar

Text Solution

Verified by Experts

The correct Answer is:
D
No. of moles of `H_2S`=0.195
No. of moles of `H_2O=1000/18`=55.55 mol
Mole fraction of `H_2S=0.195/(0.195+55.55)`=0.0035
Pressure at STP = 0.987 bar
According to Henry's law , p=`K_Hx`
or `K_H=(p_(H_2S))/(x_(H_2S))=0.987/0.0035`=282 bar
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