1. What is Sodium Sulfide (Na₂S)?

Sodium sulfide is an inorganic chemical compound with the formula Na₂S. It's a colorless water-soluble salt that gives strongly alkaline solutions and has a molar mass of 78.045 g/mol.

2. How is Molar Mass Calculated?

The molar mass is calculated using the formula:

Where:

• Atomic Mass of Sodium (Na) = 22.98977 g/mol
• Atomic Mass of Sulfur (S) = 32.065 g/mol

Calculation: (2 × 22.98977) + 32.065 = 78.045 g/mol

3. Importance of Molar Mass

Details: Molar mass is crucial for stoichiometric calculations in chemical reactions, solution preparation, and determining molecular composition.

4. Using the Calculator

Tips: The calculator uses standard atomic weights. For precise calculations in research, use the most current IUPAC atomic weights.

5. Frequently Asked Questions (FAQ)

Q1: Why is the molar mass important?
A: It's essential for converting between grams and moles, which is fundamental in chemical calculations and laboratory work.

Q2: What are the units of molar mass?
A: Molar mass is expressed in grams per mole (g/mol).

Q3: Does molar mass change with temperature?
A: No, molar mass is a constant property of a substance, though the atomic weights may be updated as measurement techniques improve.

Q4: How accurate is this calculation?
A: It uses standard atomic weights accurate to 4-5 decimal places, sufficient for most laboratory applications.

Q5: What is Na₂S used for?
A: It's used in water treatment, paper industry, textile production, and chemical manufacturing.