12.0 L of gas in a piston at a pressure of 2.00 atm are compressed until the volume is 7.00 L. What is the new pressure inside the piston?

The new pressure inside the piston is 3.43 atm

Calculation

The new pressure is calculated using Boyle's law formula

that is P1V1 = P2V2 where,

P1 = 2.00 atm

V1 = 12.0 L

P2=?

V2 = 7.00 L

make P2 the subject of the formula by diving both side by V2

P2 = P1V1/V2

P2 = (2.00 atm x12.0 L) / 7.00L = 3.43 atm