If you have 124 grams of sodium oxide (Na2O), how many moles of sodium oxide do you have?

• A. 2.0 moles
• B. 0.5 mole
• C. 4.0 moles
• D. 1.0 mole

Answer: (A)

Verified step by step guidance

1. Identify the chemical formula of sodium oxide, which is \(\mathrm{Na_2O}\).
2. Calculate the molar mass of sodium oxide by summing the atomic masses of its elements: sodium (Na) and oxygen (O). Use the atomic masses approximately as \(\mathrm{Na} = 22.99\ \mathrm{g/mol}\) and \(\mathrm{O} = 16.00\ \mathrm{g/mol}\). The molar mass is calculated as \$2 \times 22.99 + 16.00$.
3. Use the formula to find moles from mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
4. Substitute the given mass of sodium oxide (124 grams) and the molar mass you calculated into the formula.
5. Perform the division to find the number of moles of sodium oxide present in 124 grams.