Chapter 3.1, Problem 2CP

What is the formula mass of calcium citrate ${\text{[Ca}}_{\text{3}}{\left({\text{C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{O}}_{\text{7}}\right)}_{\text{2}}]$ ?

$\begin{array}{l}\text{a)}\hfill \\ \text{309}\text{.34 amu}\hfill \\ \text{b)}\hfill \\ \text{69}\text{.10 amu}\hfill \\ \text{c)}\hfill \\ \text{229}\text{.18 amu}\hfill \\ \text{d)}\hfill \\ \text{498}\text{.44 amu}\hfill \\ \text{e)}\hfill \\ \text{418}\text{.28 amu}\hfill \\ \hfill \end{array}$