Answer:
The volume of the gas is 5 liters. See the explanation below , please.
Explanation:
We use the Boyle-Mariotte´s Law (we consider that the temperature is constant according to the given statement):
P initial x V initial = P final x V final
500 torr x 3 liters = 300 torr x V final
V final= (500 torr x 3 liters)/300 torr = 5 liters
