The mass of $AgN{O}_3(s)$ needed to prepare $1\mathrm{.}000L$ of $0\mathrm{.}1MAgN{O}_3(169\mathrm{.}87\frac{g}{m}ol)$ solution from the primarystandard$-$grade solid is

a$.18\mathrm{.}548g$

b$.16\mathrm{.}987g$

c$.16\mathrm{.}139g$

d$.9\mathrm{.}843g$

The molar analytical concentration of $S{O}_4^{2-}$ ions in the solution produced when $25\mathrm{.}0ml$ of Distilled water were added to $20\mathrm{.}0ml$ of $0\mathrm{.}82MFeS{O}_{4(aq)}$ is

a$.1\mathrm{.}09M$

b$.2\mathrm{.}53M$

c$.0\mathrm{.}73M$

d$.0\mathrm{.}11M$

e$.0\mathrm{.}36M$