Answer: 5 atm
Explanation: The total pressure of a mixture of gases is given by the Ideal Gas Law: PV = nRT, where P is the total pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in kelvins.
In a constant temperature scenario, where the volume and the number of moles of the gases are kept constant, the total pressure of the mixture is simply the sum of the individual pressures of the gases. So in this case, the total pressure will be 2 atm + 3 atm = 5 atm.