A student seals a sample of \(1.00 \, \text{mol}\) of \(\text{CO}_2(g)\) in a rigid \(1.00 \, \text{L}\) container. At \(250 \, \text{K}\), the student measures the pressure and determines that the ratio of measured pressure to ideal pressure, \(P_{\text{measured}} / P_{\text{ideal}}\), is less than \(1\). The student then heats the sealed container to \(1200 \, \text{K}\). Which of the following best predicts the value of the ratio \(P_{\text{measured}} / P_{\text{ideal}}\) at \(1200 \, \text{K}\) and provides the correct physical justification?