\textbf{212-} In a reaction of a mixture of isotopes $^{16}\text{O}$ and $^{18}\text{O}$ with isotopes $^{25}\text{Mg}$ and $^{24}\text{Mg}$, how many acids can be formed with different molar masses? (Both elements have different molar masses; consider the highest capacity from your perspective. Assume the atomic mass of each element equals its mass number in $\text{g.mol}^{-1}$.)
(1) $1.075 \cdot 6$ \hfill (2) $1.025 \cdot 4$ \hfill (3) $1.075 \cdot 4$ \hfill (4) $1.025 \cdot 6$