A balloon has an initial pressure of 2 atm. The pressure is changed to 1 atm and the volume changed to 400 mL. What was the initial volume?

Answer 1

Given:

P1 = 2 atm

P2 = 1 atm

V2 = 400 ml

Asked for:

V1

Use P1V1 = P2V2 and solve for V1

V1 = P2V2/P1

Plug in the above values and solve.