The equilibrium constant for the reaction
`H_(2)(g)+S(s) hArr H_(2)S(g)`
is `18.5` at `925 K` and `9.25` at `1000 K`, respectively. Calculate the enthalpy of the reaction.

Explanation

To calculate the enthalpy of the reaction using the given equilibrium constants at two different temperatures, we can use the Van't Hoff equation. Here’s a step-by-step solution:

### Step 1: Write down the Van't Hoff equation
The Van't Hoff equation relates the change in the equilibrium constant (K) with temperature (T) to the enthalpy change (ΔH) of the reaction:
\[ \log \left( \frac{K_2}{K_1} \right) = \frac{\Delta H^\circ}{2.303 \cdot R} \cdot \frac{(T_2 - T_1)}{T_1 \cdot T_2} \]
where:
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