A gaseous mixture containing 1.5 mol Ar and 3.5 mol CO₂ has a total pressure of 8.4 atm.What is the partial pressure of CO₂? A) 3 atm B) 2 atm C) 25 atm D) 6 atm E) 8 atm

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Quizplus · Accepted Answer

The partial pressure of a gas in a mixture is given by Dalton's Law of Partial Pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases. The partial pressure of a gas can be calculated using the formula: $P_{\text{gas}} = (n_{\text{gas}} / n_{\text{total}}) \times P_{\text{total}}$, where $n_{\text{gas}}$ is the moles of the gas, $n_{\text{total}}$ is the total moles of the gas mixture, and $P_{\text{total}}$ is the total pressure of the gas mixture. For COS, $n_{\text{COS}} = 3.5$ mol, $n_{\text{total}} = 1.5 + 3.5 = 5$ mol, and $P_{\text{total}} = 8.4$ atm. Thus, $P_{\text{COS}} = (3.5 / 5) \times 8.4 = 5.88$ atm, which rounds to 6 atm, making D the correct answer.

A Gaseous Mixture Containing 1