a$)0\mathrm{.}01547$

$c$

$*$the $95\%$ confidence interval, and the relative standard deviation for this data set. $t=3\mathrm{.}182$ for $3$ degree of freedom of $95\%$ confidence.

$a.0\mathrm{.}102+-\mathrm{.}002$

b$.0\mathrm{.}101=\mathrm{.}004$

$c-0\mathrm{.}201=\mathrm{.}02$

d$.0\mathrm{.}101=,002$

$17.$A $3\mathrm{.}22g$ sample of impure lead nitrate was analyzed by gravimetric analysis to determine the percentage of lead precipitate was filtered, washed, and dried before been weighed. When weighed, the precipitate had a mass of $1\mathrm{.}44g.$ the mass percent of $Pb$ in impure sample $Pb(N{O}_3{)}_{2(aq)}+N{a}_{2}S{O}_{4(20)}$

$Pb(N{O}_3{)}_2(aq)+N{a}_{2}S{O}_{4(aa)}$

$(mwt$ for $PbS{O}_{4}303\mathrm{.}26\frac{g}{m}ol$ and Atomic mass for $pb207\mathrm{.}2g\frac{b}{m}at)$

a$-60\mathrm{.}59\%$

b$-44\mathrm{.}27\%$

c$.80\mathrm{.}71\%$

d$-30\mathrm{.}55\%$