What is the new volume of a balloon originally at 755 torr and 5.00 l is placed in a container in which the pressure is increased to 1.25 atm?

Boyle's law states that pressure is inversely proportional to volume at constant temperature

PV = k

where P - pressure, V - volume and k - constant

P1V1 = P2V2

where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation

P1 - 755 torr x 0.00131 atm/torr = 0.989 atm

substituting the values in the equation

0.989 atm x 5.00 L = 1.25 atm x V

V = 3.96 L

new volume is 3.96 L