problem $4)$ find COD and ThOD of $2\mathrm{.}5$ mM of $C_{40}{H}_{81}{O}_{21}{N}_8{P}_2?$

$C_{40}(40)(12\mathrm{.}01)=480\mathrm{.}4$

$H_{81}(B1)(1\mathrm{.}008)=81\mathrm{.}65$

$O_{21}(21)(16)=336$

$P_2$supe$(2)(30\mathrm{.}97)=61\mathrm{.}94$

$s=(1)(32\mathrm{.}07)=\frac{32\mathrm{.}07}{\frac{1104\mathrm{.}149}{1001}}$

ThOD $=$COD$+$NOD

NOD

$1$

$(41104\mathrm{.}14{)}_{sn}1$ recuics $(19132{)}_9$ mof $O_2$

$(4416\mathrm{.}56)gm$

$(6112{)}_{9m}$

$\frac{6112(m)}{4416\mathrm{.}56(m)}=1,382760,35mg$

COD$=3820\frac{mg}{l}$