For the following, use these partial pressures:

pO$2388\mathrm{.}8$ N$/$m$2$

pO $28\mathrm{.}16$ N$/$m$2$

pN$25661$ N$/$m$2$

PN $39\mathrm{.}80$ N$/$m$2$

pNO $3176$ N$/$m$2$

d$)$ Compute the mixture molecular mass in kg$/$kmol