Question

In the following compressibility factor (Z) vs pressure graph at 300 K, the compressibility of $C{H}_4$ at pressure < 200 bar deviates from ideal behaviour because;

• A. The molar volume of $C{H}_4$ is less than its molar volume in the ideal state
• B. The molar volume of $C{H}_4$ is same as that in its ideal state
• C. Intermolecular interactions between $C{H}_4$ molecules decresases
• D. The molar volume of $C{H}_4$ is more than its molar volume in the ideal state

Answer 1

The correct option is A The molar volume of $C{H}_4$ is less than its molar volume in the ideal state

$Z=\frac{(V_M{)}_r}{(V_M{)}_i}<1atP<200bar\therefore (V_M{)}_r<(V_M{)}_i$