`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.

Explanation

To calculate Henry's law constant (K_H) for hydrogen sulfide (H₂S) based on its solubility in water, we can follow these steps:

### Step 1: Understand the relationship defined by Henry's Law
Henry's law states that the solubility of a gas in a liquid is proportional to the partial pressure of that gas above the liquid. The formula is given by:
\[ K_H = \frac{P}{X} \]
where:
- \( K_H \) = Henry's law constant
- \( P \) = partial pressure of the gas
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