The graph below shows the change in pressure as the temperature increases for a 1-mol sample of a gas confined to a 1-L container. The four plots correspond to an ideal gas and three real gases: CO₂, N₂, and Cl₂.

(a) At room temperature, all three real gases have a pressure less than the ideal gas. Which van der Waals constant, a or b, accounts for the influence intermolecular forces have in lowering the pressure of a real gas?

(b) Use the van der Waals constants in Table 10.3 to match the labels in the plot (A, B, and C) with the respective gases (CO₂, N₂, and Cl₂).

Table : 10.3

Transcribed Image Text:

45 -- Ideal gas Gas A - 40 Gas B Gas C 35 30 25 15 250 300 450 350 400 500 550 Temperature (K) Pressure (atm) 20