What is the amount, in moles, of each elemental sample?
$$\begin{array}{ll}{\text { a. } 11.8 \mathrm{g} \text { Ar }} & {\text { b. } 3.55 \mathrm{g} \mathrm{Zn}} \\ {\text { c. } 26.1 \mathrm{g} \mathrm{Ta}} & {\text { d. } 0.211 \mathrm{g} \mathrm{Li}}\end{array}$$