The volume will be 674 ml.
Explanation:
As the temperature is said to be constant, then the present system will be obeying Boyle's law. So according to this law, the volume of a gaseous system is inversely proportional to the pressure of the system at constant temperature and number of moles.
So according to this law, [tex]P_{1} V_{1} = P_{2} V_{2}[/tex]
As here the initial pressure is 3.52 atm and the initial volume is 354 mL with the reduced pressure as 1.85 atm. Since, there is a decrease in the pressure, there tends to increase in the volume.
So, [tex]354 * 3.52 = 1.85 * V_{2}[/tex]
[tex]V_{2} =674 ml[/tex]
So, the volume will be 674 ml.
