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