A chemist needs $2\mathrm{.}00g$ of a liquid compound as a reagent for a reaction. The density of the liquid is $0\mathrm{.}718\frac{g}{m}L.$ What volume of the liquid should he use? If the compound costs $$3\mathrm{.}51$ per milliliter, what is the cost of to purchase $100mL$ of the reagent?