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# $H_2S$, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of $H_2S$ in water at STP is 0.195 m, calculate Henry’s law constant. It is given that the solubility of $H_2S$ in water at STP is 0.195 m, i.e., 0.195 mol of $H_2S$ is dissolved in 1000 g of water.

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