Question

A mixture of helium, nitrogen, and oxygen has a total pressure of 756 mmHg. The partial pressures of helium and nitrogen are 229 mmHg and 205 mmHg, respectively. What is the partial pressure of oxygen in the mixture?

Answer 1

322 mmHg

Step-by-step explanation:

Step 1: Given data

• Total pressure of the gaseous mixture (P): 756 mmHg

• Partial pressure of helium (pHe): 229 mmHg

• Partial pressure of nitrogen (pN₂): 205 mmHg

Step 2: Calculate the partial pressure of oxygen (pO₂)

The total pressure of the gaseous mixture is equal to the sum of the partial pressures of the individual gases.

P = pHe + pN₂ + pO₂

pO₂ = P - pHe - pN₂

pO₂ = 756 mmHg - 229 mmHg - 205 mmHg

pO₂ = 322 mmHg