Using Boyle's law:
\( P_1 V_1 = P_2 V_2, \)
substitute \(P_1 = 50\) atm, \(V_1 = 50\) L, and \(P_2 = 1\) atm:
\( V_2 = \frac{P_1 V_1}{P_2} = \frac{50 \times 50}{1} = 2500 \text{ L}. \)