How many moles of calcium fluoride , `CaF_(2)`, must be dissolved in 2.0 L of water at `25^(@)`C to form a saturated solution?

A. `2.6xx10^(-2)` mol
B. `1.3xx10^(-3)` mol
C. `6.8xx10^(-4)` mol
D. `3.4xx10^(-4)` mol

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