For the chemical reaction, `3X_((g)) + Y_((g)) hArr X_(3) Y_((g))` , the amount of `X_(3)Y` at cquilibrium is affected by :

Options

A. Temperature and pressure
B. Temperature only
C. Pressure only
D. Temperature, pressure and catalyst

Answer

To determine how the amount of \( X_3Y \) at equilibrium is affected in the reaction \( 3X_{(g)} + Y_{(g)} \rightleftharpoons X_3Y_{(g)} \), we can analyze the factors influencing chemical equilibrium.

### Step-by-Step Solution:

1. **Identify the Reaction**:
The reaction is given as:
\[ 3X_{(g)} + Y_{(g)} \rightleftharpoons X_3Y_{(g)} \]
Here, \( X \) and \( Y \) are reactants, and \( X_3Y \) is the product.

2. **Count Moles of Reactants and Products**:
- On the reactant side, we have 3 moles of \( X \) and 1 mole of \( Y \), totaling 4 moles.
- On the product side, there is 1 mole of \( X_3Y \).
- Thus, the total number of moles changes from 4 moles (reactants) to 1 mole (product).

3. **Effect of Pressure**:
- According to Le Chatelier's principle, if the number of moles of gas decreases (from 4 to 1), increasing the pressure will shift the equilibrium to the right, favoring the formation of \( X_3Y \).
- Therefore, the amount of \( X_3Y \) at equilibrium will be affected by changes in pressure.

4. **Effect of Temperature**:
- The reaction can either be exothermic (releases heat) or endothermic (absorbs heat).
- If the forward reaction is exothermic, increasing the temperature will shift the equilibrium to the left (favoring reactants), thus decreasing the amount of \( X_3Y \).
- Conversely, if the forward reaction is endothermic, increasing the temperature will shift the equilibrium to the right (favoring products), thus increasing the amount of \( X_3Y \).
- Therefore, temperature also affects the amount of \( X_3Y \) at equilibrium.

5. **Conclusion**:
- Both temperature and pressure affect the amount of \( X_3Y \) at equilibrium.
- Therefore, the correct answer is that the amount of \( X_3Y \) at equilibrium is affected by both temperature and pressure.

### Final Answer:
The amount of \( X_3Y \) at equilibrium is affected by **temperature and pressure**.

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