To find the pressure, we can use the Ideal Gas Law: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
First, we need to convert the mass of oxygen (4.04 kg) to moles. The molar mass of oxygen (O2) is 32.00 g/mol.
4.04 kg * 1000 g/kg = 4040 g
4040 g / 32.00 g/mol = 126.25 moles of oxygen
Next, convert the temperature from Celsius to Kelvin:
23°C + 273.15 = 296.15 K
Now we can plug in the values into the Ideal Gas Law equation:
P * 50.0 L = 126.25 mol * 0.0821 L * atm / (mol * K) * 296.15 K
P = (126.25 * 0.0821 * 296.15) / 50.0
P ≈ 62.43 atm
The pressure of the tank is approximately 62.43 atm.