What is the mass, in grams, of each elemental sample?
$$\begin{array}{l}{\text { a. } 2.3 \times 10^{-3} \text { mol Sb }} \\ {\text { b. } 0.0355 \text { mol Ba }} \\ {\text { c. } 43.9 \text { mol Xe }} \\ {\text { d. } 1.3 \text { mol } W}\end{array}$$