Passage VI
The ideal gas law (IGL) describes the physical behavior of gases. Although ideal gases do not exist, the IGL is a useful model for many real gases. A researcher used the IGL to predict trends in the pressure of an ideal gas under various sets of conditions. Then, the researcher performed 3 experiments to compare the IGL predictions with trends in the pressure of each of 2 real gases (Gas Y and Gas Z) under the same sets of conditions. The conditions that were varied for an ideal gas, for Gas Y, and for Gas Z were the following:
·The gas temperature, T (in kelvins, K)
·The amount of gas, n (in moles, mol; 1 mol=6.0 x 1023 atoms or molecules), in a container
·The volume of the container, V (in liters, L)
Experiment 1
The pressure, P (in megapascals, MPa), of an n=1 mol sample of Gas Y in a 1.0 L container was recorded for values of T from 200 K to 450 K. This procedure was repeated for Gas Z. Figure 1 shows the trends for the 2 gases. Also shown is the trend predicted by the IGL.
Experiment 2
The pressure, P, of a sample of Gas Y in a 1.0 L container was recorded for values of n from 1 mol to 10 mol, while T was held constant at 400 K. This procedure was repeated for Gas Z. Figure 2 shows the trends for the 2 gases and the trend predicted by the IGL.
Experiment 3
The pressure, P, of an n=1 mol sample of Gas Y in a container of adjustable volume was recorded for values of V from 0.5 L to 1.0 L. while T was held constant at 400 K. This procedure was repeated for Gas Z. Figure 3 shows the trends for the 2 gases and the trend predicted by the IGL.
38. The containers used in Experiments 1-3 could withstand the same maximum pressure. Based on the results of the experiments, that maximum pressure must have been closest to which of the following?
Your Answer is
Correct Answer is J
Explanation
Look at the gas pressure P represented by the ordinate in the three pictures up to about 110 MPa, so the maximum pressure that the container can withstand must be greater than this value, and the J option is the closest