Answer:
The answer is
784 mL
Step-by-step explanation:
In order to find the new volume attained we use the formula for Boyle's law
That's

Since we are finding the final volume

where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
From the question
P1 = 2.4 atm
V1 = 490 mL
P2 = 1.5 atm
So we have

We have the final answer as
784 mL
Hope this helps you