Final answer:
The pressure in the tank at a constant temperature of 25°C is 9.00 atm.
Step-by-step explanation:
To solve this question, we need to apply Dalton's law of partial pressures. Dalton's law states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases.
Given that the stainless steel container is charged with 4.00 atm of hydrogen gas and 5.00 atm of oxygen gas, the total pressure in the tank is simply the sum of these partial pressures.
Therefore, the pressure in the tank at a constant temperature of 25°C is 4.00 atm + 5.00 atm = 9.00 atm.