1. Find the molar mass of sodium sulfide:
* Sodium (Na) has a molar mass of 22.99 g/mol.
* Sulfur (S) has a molar mass of 32.06 g/mol.
* Since sodium sulfide has two sodium atoms, the molar mass is: (2 * 22.99 g/mol) + 32.06 g/mol = 78.04 g/mol
2. Use the formula:
* moles = mass / molar mass
3. Plug in the values:
* moles = 125.00 g / 78.04 g/mol
* moles ≈ 1.602 mol
Therefore, there are approximately 1.602 moles in 125.00 grams of sodium sulfide.
