Final answer:
The volume of the gas remains at 1.20 liters since the provided conditions (61.3 kPa and 25.0 degrees Celsius) indicate no change in volume is being contemplated.
Step-by-step explanation:
The volume of 1.20 liters of gas at 61.3 kPa and 25.0 degrees Celsius, assuming the gas follows the ideal gas law, is actually 1.20 liters. We have both pressure and temperature information provided, and there's no indication that a change in conditions (such as a change in volume, pressure, or temperature) is being considered. Therefore, additional information is not required to state the volume of the gas under the given conditions.