Question

The behaviour of a real gas is usually depicted by plotting compression factor Z $\left( = \frac{V_{real}}{V_{ideal}} \right)$versus P at a constant temperature. At hight temperature and high pressure , Z , is usually more than one. This fact can be explained by vanderwaals equation when-

• A. The constant ‘a’ is negligible and not ‘b’
• B. The constant ‘b’ is negligible and not ‘a’
• C. Both the constant ‘a’ and ‘b’ are negligible
• D. Both the constants ‘a’ and ‘b’ are not negligible

Answer 1

Answer: (A)

The constant ‘a’ is negligible and not ‘b’

Answer 2

P(V_m – b) = RT

or Z = 1 + $\frac{Pb}{RT}$ or Z > 1