1. What is Molar Mass?

Molar mass is the mass of one mole of a substance (chemical element or chemical compound) expressed in grams per mole (g/mol). It is a physical property that is useful in various chemical calculations.

2. How is Molar Mass Calculated?

The molar mass is calculated by summing the atomic masses of all atoms in a molecule:

Examples:

• NaCl: 22.99 (Na) + 35.45 (Cl) = 58.44 g/mol
• H₂O: 2×1.008 (H) + 15.999 (O) = 18.015 g/mol

3. Importance of Molar Mass

Details: Molar mass is essential for converting between grams and moles, preparing solutions with specific concentrations, and stoichiometric calculations in chemical reactions.

4. Using the Calculator

Tips: Simply select the compound from the dropdown menu and click "Calculate" to see its molar mass.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molecular weight and molar mass?
A: They are numerically identical but molecular weight is dimensionless while molar mass has units of g/mol.

Q2: Why are the atomic masses not whole numbers?
A: Atomic masses account for natural isotopic abundance of elements.

Q3: How precise are these molar mass values?
A: Values are based on IUPAC atomic weights and typically precise to 2 decimal places.

Q4: Can I calculate molar mass for any compound?
A: Yes, by summing atomic masses of all atoms in the molecular formula.

Q5: Where can I find atomic mass values?
A: From the periodic table or IUPAC atomic weight tables.