Moody $[1]$ studied the efficiency of a GC separation of $2-$butanone on a dinonyl phthalate

column. Evaluating plate height as a function of flow rate gave a van Deemter equation for

which A is $1\mathrm{.}65$ mm$,$ B is $25\mathrm{.}8$ mm$$mL$/$min$,$ and C is $0\mathrm{.}0236$ mm$$min$/$mL$.$

a$)$ Using Microsoft Excel, plot a graph of H versus u for flow rates in the range of $5120$

mL$/$min$.$ Your graph must include curves due to the contributions of all the terms $($i$.$e$.$ Curve for A$,$ B and C and the overall curve$)$

b$)$ For what range of flow rates does each term in the Van Deemter equation have the

greatest effect?

c$)$ How much is the optimum flow rate for this column?

d$)$ How much is the height of a theoretical plate for the flow rate in part C $?$