1. What is Molar Mass?

Molar mass is the mass of one mole of a substance (chemical element or chemical compound). It is expressed in grams per mole (g/mol) and is numerically equal to the substance's relative atomic/molecular mass.

2. How to Calculate Molar Mass

The formula for calculating molar mass is:

Where:

• \( MW \) — Molar mass (g/mol)
• \( \text{atomic masses} \) — Standard atomic weights of elements
• \( \text{counts} \) — Number of atoms of each element in the formula

Example: For H₂O (water), molar mass = (2 × 1.008) + (1 × 15.999) = 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 performing stoichiometric calculations in chemical reactions.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molar mass and molecular weight?
A: Molar mass has units (g/mol) while molecular weight is dimensionless, but numerically they're often the same.

Q2: How accurate are the calculated molar masses?
A: Accuracy depends on the precision of the atomic weights used. Standard atomic weights account for natural isotopic distributions.

Q3: Does the calculator handle hydrates and complex formulas?
A: Yes, enter formulas like CuSO4·5H2O for hydrated compounds.

Q4: What about ions and charged species?
A: The calculator uses neutral element masses. For precise work with ions, consider the mass difference from electrons (usually negligible).

Q5: Where do the atomic weights come from?
A: From IUPAC's standard atomic weights based on natural isotopic abundances.