Chemistry stuck on problem

Question

The total pressure of an O_{2} Ar, He gas mixture is 900mmHg If the partial pressure of Ar is 200 mmHg and the partial pressure of He is 300 mm Hg, what is the partial pressure of ,? O_{2}

Answer 1

1. To find the partial pressure of O2, we can use the fact that the sum of the partial pressures of all the gases in the mixture is equal to the total pressure of the mixture. So, we can write:
2. Partial pressure of O2 + Partial pressure of Ar + Partial pressure of He = Total pressure of the mixture
3. Let's plug in the given values:
4. Partial pressure of O2 + 200 mmHg + 300 mmHg = 900 mmHg
5. Simplifying the equation, we get:
6. Partial pressure of O2 = 900 mmHg - 200 mmHg - 300 mmHg
7. Partial pressure of O2 = 400 mmHg
8. Therefore, the partial pressure of O2 in the gas mixture is 400 mmHg