What is the mass of 0.25 mole of sodium (Na)?

• A. 5.75 g
• B. 2.30 g
• C. 11.5 g
• D. 10.0 g

Answer: (A)

Verified step by step guidance

1. Identify the given quantity: 0.25 mole of sodium (Na).
2. Recall that the molar mass of sodium (Na) is approximately 23.0 g/mol. This value represents the mass of one mole of sodium atoms.
3. Use the formula to calculate mass from moles: \(\text{mass} = \text{moles} \times \text{molar mass}\).
4. Substitute the known values into the formula: \(\text{mass} = 0.25 \text{ mole} \times 23.0 \text{ g/mole}\).
5. Perform the multiplication to find the mass of 0.25 mole of sodium.