300 L of ammonia gas at `20^(@)C` and 20 atm pressure is allowed to expand in a space of 600 L capacity and to a pressure of 1 atm. Calculate the drop in temperature.

Explanation

To solve the problem of calculating the drop in temperature when 300 L of ammonia gas at 20°C and 20 atm pressure expands to a volume of 600 L at a pressure of 1 atm, we can use the combined gas law, which states that:

\[ \frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2} \]

### Step 1: Identify the given values
- Initial pressure, \( P_1 = 20 \, \text{atm} \)
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