A gas mixture containing oxygen, nitrogen, and carbon dioxide has a total pressure of 302.9 kilopascals. If the partial pressure of oxygen is 60.6 kPa and the partial pressure of nitrogen is 230 kPa , what is the partial pressure of carbon dioxide?

To determine the partial pressure of carbon dioxide (CO₂) in the gas mixture, you can use **Dalton's Law of Partial Pressures**. This law states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas present in the mixture. **Given:** - Total pressure (Pₜₒₜ) = 302.9 kPa - Partial pressure of oxygen (P_O₂) = 60.6 kPa - Partial pressure of nitrogen (P_N₂) = 230 kPa **Formula:** \[ P_{\text{CO}_2} = P_{\text{total}} - P_{\text{O}_2} - P_{\text{N}_2} \] **Calculation:** \[ P_{\text{CO}_2} = 302.9\, \text{kPa} - 60.6\, \text{kPa} - 230\, \text{kPa} \] \[ P_{\text{CO}_2} = 302.9\, \text{kPa} - 290.6\, \text{kPa} \] \[ P_{\text{CO}_2} = 12.3\, \text{kPa} \] **Answer:** The partial pressure of carbon dioxide is **12.3 kPa**.