1. What is Molar Mass?

Molar mass is the mass of a given substance (chemical element or chemical compound) divided by its amount of substance. It is typically expressed in grams per mole (g/mol).

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Atomic Masses — The atomic weights of each element (g/mol)
• Counts — The number of atoms of each element in the molecule
• Σ — Summation of all (atomic mass × count) pairs

Explanation: The calculator sums the product of each element's atomic mass multiplied by how many times it appears in the molecule.

3. Importance of Molar Mass Calculation

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

4. Using the Calculator

Tips: Enter atomic masses as comma-separated values (e.g., "12.01, 1.01, 16.00") and counts as comma-separated integers (e.g., "6, 12, 6" for glucose). Both lists must have the same number of values.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find atomic masses?
A: Atomic masses are found on the periodic table. Use the weighted average of naturally occurring isotopes.

Q2: How do I calculate molar mass for hydrates?
A: Include water molecules in your calculation (H₂O = 18.015 g/mol) multiplied by the hydration number.

Q3: What's the difference between molecular mass and molar mass?
A: Molecular mass is the mass of one molecule (in atomic mass units), while molar mass is the mass of one mole of molecules (in g/mol).

Q4: How precise should my atomic masses be?
A: For most calculations, 2-4 decimal places are sufficient. Use more precise values for exact work.

Q5: Does this work for ionic compounds?
A: Yes, the same principle applies - sum the atomic masses of all atoms in the formula unit.