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63.0 grams of sodium fluoride was dissolved in water so that the final volume was 25.0 ml. What is the molarity of this solution?

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moles = grams NaF/molar mass NaF. You know grams. You can calculate molar mass. Solve for moles.
Then M = molarity = mols/L. You know moles. You have mL so convert to L and solve for M.
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