If a gas occupies 4.5 L at a pressure of 2.0 atm, what will be its volume at a pressure of 3.5 atm? Whose Law?

The volume will be 2, 57 L

Explanation:

We use Boyle Mariotte's Law: for a given mass of gas at constant temperature, the pressure and volume vary inversely proportionally.

P1 x V1=P2 x V2

V2 = (P1xV1) / P2 = (2,0 atm x 4,5 L) / 3, 5 atm = 2, 57 L