The pressure of inert gas if the volume of gas is increased to 9.4l is calculated using P1v1= P2 V2 formula where p is for pressure while is for volume
P1 = 735 mm hg
v1 = 5.6 L
V2= 9.4 L
P2= ?
from the formula above P2 = P1V1/ V2
p2= 735mmhg x5.6 L/ 9.4l= 437.87 mmhg