1. What is Molar Mass?

Molar mass (MW) is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated as the sum of the atomic masses of all atoms in a molecule's chemical formula.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( MW \) — Molar mass (g/mol)
• Atomic masses — From standard periodic table values

Explanation: The calculator parses the chemical formula and sums the atomic weights of all atoms in the molecule.

3. Importance of Molar Mass Calculation

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

4. Using the Calculator

Tips: Enter the molecular formula using standard notation (e.g., H2O for water, C6H12O6 for glucose). Subscripts should follow element symbols directly.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molecular weight and molar mass?
A: While often used interchangeably, molecular weight is technically dimensionless (relative to 1/12 of carbon-12), while molar mass has units of g/mol.

Q2: How are parentheses handled in formulas?
A: Parentheses indicate repeating groups. For example, Ca(OH)2 means one calcium, two oxygens, and two hydrogens.

Q3: What about hydrates?
A: Hydrates (like CuSO4·5H2O) should be entered with the dot notation, and the calculator will include the water molecules in the total mass.

Q4: Are isotopes considered?
A: The calculator uses average atomic masses from the periodic table. For specific isotopes, you would need to input exact atomic masses.

Q5: How accurate are the calculations?
A: Accuracy depends on the precision of the atomic weights used, typically to 2-4 decimal places based on IUPAC values.