What is the mass percent of Na in NaF? Provide your answer to two decimal places.

• A. 39.34%
• B. 45.25%
• C. 54.75%
• D. 50.00%

Answer: (B)

Verified step by step guidance

1. Identify the chemical formula of the compound, which is NaF, meaning it contains one atom of sodium (Na) and one atom of fluorine (F).
2. Find the atomic masses of sodium and fluorine from the periodic table: sodium (Na) has an atomic mass of approximately 22.99 g/mol, and fluorine (F) has an atomic mass of approximately 18.998 g/mol.
3. Calculate the molar mass of NaF by adding the atomic masses of sodium and fluorine: \(\text{Molar mass of NaF} = 22.99 + 18.998\) g/mol.
4. Calculate the mass percent of sodium in NaF using the formula: \(\text{Mass \% of Na} = \left( \frac{\text{Atomic mass of Na}}{\text{Molar mass of NaF}} \right) \times 100\).
5. Substitute the values into the formula and simplify to find the mass percent of sodium in NaF, rounding your answer to two decimal places.