1. What is Molar Mass?

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It's a fundamental concept in chemistry used for stoichiometric calculations and converting between mass and moles of a substance.

2. How to Calculate Molar Mass

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

Where:

• \( MW \) — Molar mass (g/mol)
• \( n_i \) — Number of atoms of element i
• \( A_i \) — Atomic weight of element i (g/mol)

Example: For water (H₂O): (2 × 1.008) + (1 × 15.999) = 18.015 g/mol

3. Importance of Molar Mass

Details: Molar mass is essential for preparing solutions, determining reaction yields, converting between grams and moles, and understanding stoichiometric relationships in chemical reactions.

4. Using the Calculator

Tips: Enter the chemical formula using standard notation (e.g., H2O, C6H12O6). For polyatomic ions, include parentheses when needed (e.g., Ca(OH)2).

5. Frequently Asked Questions (FAQ)

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

Q2: How do I calculate molar mass for hydrates?
A: Include the water molecules in the formula (e.g., CuSO₄·5H₂O would include 5 water molecules in the calculation).

Q3: Where can I find atomic weights?
A: Standard atomic weights are published by IUPAC and available in periodic tables.

Q4: How accurate is this calculator?
A: This demo version recognizes common compounds. A full implementation would parse any valid chemical formula.

Q5: Does molar mass change with temperature?
A: No, molar mass is a constant property of a substance regardless of physical conditions.