Question

What is the unit of Van der Waals constant?

Answer 1

Van der Waal equation:

• Johannes Diderik van der Waals in the year 1873 gave Van der waal equation.
• The equation is a modified version of the Ideal gas equation.
• $$\begin{gathered} \left(\mathrm{P}+\frac{{\mathrm{an}}^2}{{\mathrm{V}}^2}\right)\left(\mathrm{V}-\mathrm{nb}\right)=\mathrm{nRT}, \\ \mathrm{Where}, \\ \mathrm{P},\mathrm{V},\mathrm{T}\&\mathrm{n},\mathrm{are}\mathrm{pressure},\mathrm{volume},\mathrm{temperature}\mathrm{and}\mathrm{moles}\mathrm{of}\mathrm{gas}. \\ \text{'}\mathrm{a}\text{'}\mathrm{and}\text{'}\mathrm{b}\text{'}\mathrm{are}\mathrm{van}\mathrm{der}\mathrm{waal}\mathrm{constant}. \end{gathered}$$

Units of Van der waals Constant:

• Unit of “a” is $\mathrm{atm}{\mathrm{Lit}}^2{\mathrm{mol}}^{-2}$
• Unit of “b” is $\mathrm{Litre}{\mathrm{mol}}^{-1}$