To calculate the partial pressure of oxygen in a 2-liter container, we need to know the total pressure and the composition of the gas mixture. Let's assume that the container is filled with air at sea level, where the total pressure is approximately 1 atmosphere (atm).

Air is a mixture of gases, primarily consisting of nitrogen (N2), oxygen (O2), and argon (Ar). The approximate composition of air at sea level is:

- Nitrogen (N2): 78.08%

- Oxygen (O2): 20.95%

- Argon (Ar): 0.93%

- Other gases: 0.04%

Since we know the percentage of oxygen in the air, we can calculate the partial pressure of oxygen using the following formula:

Partial pressure of oxygen = Total pressure × Percentage of oxygen

Substituting the values:

Partial pressure of oxygen = 1 atm × 20.95%

Partial pressure of oxygen = 0.2095 atm

Therefore, the partial pressure of oxygen in a 2-liter container filled with air at sea level is approximately 0.2095 atm.