A flow of $720k\frac{g}{h}$ of a solution of $20\%$ of NaOH and water enters an evaporator to be concentrated to $60\%$ product. As it has been reported the steam temperature is $70C$ and the pressure of the evaporator is $0\mathrm{.}1$atm.

i$)$ Determine the amount of product in $30$min.

$[10$ Marks$]$

ii$)$ Calculate the steam economy in $2$ hours.

$[10$ Marksi

ii$)$ Find the boiling point elevation.

$[10$ Mart

iv$)$ Explain the change in steam econorry if the product concentration reduce to $50\%.$

$[10$ Marks$]$