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 is calculated by summing the atomic masses of all atoms in a chemical formula.

2. How to Calculate Molar Mass

The molar mass is calculated using the formula:

Where:

• \( MW \) — Molar mass (g/mol)
• \( Atomic\ Masses \) — Standard atomic weights of elements (g/mol)
• \( Counts \) — Number of atoms of each element in the formula

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

3. Importance of Molar Mass Calculations

Details: Molar mass is fundamental in stoichiometry for converting between mass and moles, determining empirical and molecular formulas, and calculating solution concentrations.

4. Using the Calculator

Tips: Enter the chemical formula using standard notation (e.g., H2O, C6H12O6, NaCl). The calculator will parse the formula and calculate the molar mass based on standard atomic weights.

5. Frequently Asked Questions (FAQ)

Q1: 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). Numerically they are equal but have different units.

Q2: How do I calculate molar mass for ionic compounds?
A: The process is the same - sum the atomic masses of all atoms in the formula unit. For example, NaCl: (22.99 + 35.45) = 58.44 g/mol.

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 weights from IUPAC. For most educational purposes, these values are sufficiently accurate.

Q5: Can I calculate molar mass for hydrates?
A: Yes, include the water molecules in the formula. For example, CuSO₄·5H₂O would be entered as CuSO4.5H2O.