How many moles are present in 29.5 grams of Na (sodium)? (Atomic mass of Na = 23.0 g/mol)

• A. 0.77 moles
• B. 0.39 moles
• C. 2.56 moles
• D. 1.28 moles

Answer: (D)

Verified step by step guidance

1. Identify the given information: mass of sodium (Na) is 29.5 grams, and the atomic mass of sodium is 23.0 g/mol.
2. Recall the formula to calculate moles from mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
3. Substitute the given values into the formula: \(\text{moles} = \frac{29.5}{23.0}\).
4. Perform the division to find the number of moles of sodium present.
5. Compare your calculated value with the provided options to identify the correct number of moles.