A gas occupying a volume of 725 mL at a pressure of 1.345 atm is allowed to expand at constant temperature until its pressure reaches 0.345 atm. What is its final volume?

Answer 1

Again, constant pressure is Boyle's law:

P1V1 = P2V2

Solving for V2, we have ...

V2 = P1V1 / P2

V2 = (1.345 atm)(725 ml) / 0.345 atm

V2 = 2826 mls = 2.826 L

V2 = 2830 mls = 2.83 L (3 sig. figs)