Question

The Vander-waals equation of state is $\left ( P+\frac{a}{v^{2}} \right )$  (v–b) = RT, where p is pressure, v is specific volume, T is temperature and R is characteristic gas constant. The SI unit of a is                                                         

      (a) J/kg-K                                                            (b) m³kg

      (c) m⁵/kg-s²                                                         (d) Pa/kg