1. What is Molar Mass?

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a chemical formula.

2. How to Calculate Molar Mass

The formula for calculating molar mass is:

Where:

• \( MW \) — Molar mass (g/mol)
• \( \sum \) — Sum of all atomic masses in the compound
• \( Atomic\ Masses \) — Individual atomic masses of elements (g/mol)

Example: For H₂O: (2 × 1.008 g/mol) + (1 × 16.00 g/mol) = 18.016 g/mol

3. Importance of Molar Mass

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

4. Using the Calculator

Tips: Enter the chemical formula using standard notation (e.g., H2O, C6H12O6, NaCl). The calculator will parse the formula and sum the atomic masses of all elements.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molecular weight and molar mass?
A: While often used interchangeably, molecular weight refers to the mass of one molecule, while molar mass refers to the mass of one mole of substance.

Q2: How do I calculate molar mass for hydrates?
A: Include the water molecules in the formula. For example, CuSO₄·5H₂O would include 1 Cu, 1 S, 4 O, 10 H, and 5 O atoms.

Q3: Why are atomic masses not whole numbers?
A: Atomic masses are weighted averages of all naturally occurring isotopes of an element, accounting for their relative abundances.

Q4: How accurate are the calculations?
A: The calculator uses standard atomic masses with four decimal places for precision, matching typical textbook values.

Q5: Can I calculate molar mass for ionic compounds?
A: Yes, the same principle applies. For example, NaCl has a molar mass of 22.99 + 35.45 = 58.44 g/mol.