Questions:

$($a$)$ A $30\%$Sn alloy of lead$-$tin is slowly cooled from a temperature of $350\backslash$deg C$.$ Determine

the:

$($i$)$ Composition of the first solid to form.

$($ii$)$ The freezing range of the alloy.

$($iii$)$ Amounts and compositions of each phase at $184\backslash$deg C$.$

$($iv$)$ Amounts and compositions of each phase at $182\backslash$deg C$.$

$($v$)$ Amounts and compositions of each phase at $25\backslash$deg C$.$

$($b$)$ Repeat part $($a$)$ but for an $80\%$ Sn alloy.