\textbf{100.} If in a galvanic cell formed from metal M and metal copper, for every 2 moles of M consumed, $3.612\times10^{24}$ electrons are exchanged, and the ratio of mass change of copper to mass change of M equals $1.84$, what is the approximate molar mass of metal M? $(\text{Cu} = 64 \text{ g.mol}^{-1})$
(1) $45$ \hfill (2) $52$ \hfill (3) $70$ \hfill (4) $59$