Passage IV

An ideal gas is a hypothetical gas that behaves exactly as predicted by the ideal gas law. Depending on the conditions, an ideal gas may or may not be a good model for a real gas. The compressibility factor (z) is a value that quantifies the deviation of a gas from ideal behavior. Figure 1 shows, for an ideal gas and for 5 real gases, how z varies with pressure (in atmospheres, atm) at 0 ℃. Table 1 shows how the volume of 1 mole (6 × 1023 atoms or molecules) of gas varies with pressure for an ideal gas, for 3 of those 5 real gases, and for air.

Figure and table adapted from E. D. Eastman and G. R. Rollefson, Physical Chemistry, 1st ed. ©1947 by McGraw-Hill Book Co.

22. Based on Figure 1 and Table 1, at 0°C and 30 atm, the volume of 1 mole of O2 will most likely be:

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

Look at the line with pressure of 30 atm in table 1 first, and find that the larger the volume of the first four gases, the higher the position of the corresponding line in figure 1;

Look at figure 1 again The O2 curve is between the CH4 and N2 curves, so it is inferred that the volume of O2 is in the CH4 Between 686 of sub>4 and 725.4 of N2