please answer a and b

Using virial EOS,

a$.$ Determine equation for pressure

$Z=\frac{PV}{RT}=1+\frac{BP}{RT}$

b$.$ calculate the pressure, atm.

$T_c=126\mathrm{.}2K$

$P_c=33\mathrm{.}5$atm

$=0\mathrm{.}04$

$T_r=\frac{T}{T_c}$

$B^o=0\mathrm{.}083-\frac{0\mathrm{.}422}{T_r^{1\mathrm{.}6}}$

$B^{\text{'}}=0\mathrm{.}139-\frac{0\mathrm{.}172}{T_r^{4\mathrm{.}2}}$

hat$(B)=B^o+B^{\text{'}}$

hat$(B)=\frac{B{P}_c}{R{T}_c}$