Given $G_s=2\mathrm{.}72,$ calculate the zero$-$air$-$void unit weight in $l\frac{b}{f}{t}^3$ for a soil at $w=6\%,13\%,16\%,17\%,$ and $19\%$

$6\%,{}_{\text{z}\text{a}\text{v}}=$

$\frac{b}{f}{t}^3$

$13\%,{}_{\text{z}\text{a}\text{v}}=$

$l\frac{b}{f}{t}^3$

$16\%,{}_{\text{z}\text{a}\text{v}}=$

$l\frac{b}{f}{t}^3$

$17\%,{}_{\text{z}\text{a}\text{v}}=$

$l\frac{b}{f}{t}^3$

$19\%,{}_{\text{z}\text{a}\text{v}}=$

$l\frac{b}{f}{t}^3$