A $30$ wt$\%$ Ni$-70$ wt$\%$ Cualloy $($Animated Figure $9\mathrm{.}3$a$)$ is slowly cooled from $1400C(2550F)$ to $1150C(2100F).$

$($a$)$ At what temperature does the first solid phase form?

$C$

$($b$)$ What is the composition of this solid phase?

$1\%$wt Ni

$($c$)$ At what temperature does the last of the liquid solidify?

$C$

$($d$)$ What is the composition of this last remaining liquid phase?

i

$\%$wt Ni