Step-by-step explanation:
To find the temperature of the gas after cooling, we can use the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. First, we will solve for the number of moles: n = PV/RT. We will then plug the known values into the equation to solve for T: n = 517 mL × 1.20 atm/0.0821 L⋅atm/K⋅mol × 335 K = 9.41 moles.