1. What is Molar Mass?

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). For compounds, it's the sum of the atomic masses of all atoms in the molecule.

2. How is Molar Mass Calculated?

The calculator uses the formula:

Where:

• \( MW \) — Molar mass (g/mol)
• \( n_{Na} \) — Number of sodium atoms
• 22.99 — Atomic mass of sodium (g/mol)
• \( n_S \) — Number of sulfur atoms
• 32.065 — Atomic mass of sulfur (g/mol)

Explanation: The molar mass is calculated by multiplying the number of each type of atom by its atomic mass and summing these values.

3. Importance of Molar Mass

Details: Molar mass is essential for stoichiometric calculations, converting between grams and moles, and determining empirical and molecular formulas.

4. Using the Calculator

Tips: Enter the number of sodium and sulfur atoms in the compound. The calculator will show both the result and the step-by-step calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why are atomic masses not whole numbers?
A: Atomic masses account for the natural abundance of isotopes of each element.

Q2: How accurate are these calculations?
A: The calculations use standard atomic weights from IUPAC. For precise work, use more significant figures.

Q3: Can I calculate molar mass for other compounds?
A: Yes, by changing the number of atoms and using appropriate atomic masses.

Q4: What's the molar mass of Na2S?
A: For Na2S (2 sodium, 1 sulfur), it's (2 × 22.99) + 32.065 = 78.045 g/mol.

Q5: Where can I find atomic masses?
A: They're available in periodic tables or from IUPAC's standard atomic weights.