Dissolve $Zn(N{O}_3)2*6H_{2}O0\mathrm{.}67g$ and Terephthalic acid $0\mathrm{.}125g,$ in $-$methyl ptrrolidone$)(20$mL$)$ and then transfer to a $20mL$ vial.

question $1.$Calculate the density of MOF$-5,$given that there are $8$ Zn$4$O$($BCD$)3$units in one unit cell.

question $2.$ What are the roles of the three types of reagents used, Zn$($NO$3)26$H$2$O$,$ Terephthalic acid, and NMP $($Nmethyl ptrrolidone$)?$