Step 1: Apply Boyle's Law for Volume Calculation Boyle's Law establishes an inverse relationship between pressure and volume for a fixed amount of gas at constant temperature:\[P_1 V_1 = P_2 V_2\]Variables:- \( P_1 \) and \( V_1 \) represent initial pressure and volume.- \( P_2 \) and \( V_2 \) represent final pressure and volume.Step 2: Input Provided Data Data:- Initial pressure \( P_1 = 2 \, \text{atm} \),- Initial volume \( V_1 = 10 \, \text{L} \),- Final pressure \( P_2 = 1 \, \text{atm} \),- \( V_2 \) is the unknown final volume.Integration into Boyle's Law:\[2 \times 10 = 1 \times V_2\]\[V_2 = 20 \, \text{L}\]Conclusion: The gas volume is \( 20 \, \text{L} \) at 1 atm and 300 K. This corresponds to option (3).