1. What is Molar Mass?

Molar mass is the mass of one mole of a substance (chemical element or chemical compound) measured in grams per mole (g/mol). It is calculated as the sum of the exact atomic masses of all atoms in a molecule.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( MW \) — Molar mass (g/mol)
• Each element's exact atomic mass is summed according to its count in the formula

Explanation: The calculator parses the chemical formula, identifies each element and its count, then sums their exact atomic masses.

3. Importance of Exact Molar Mass

Details: Exact molar mass is crucial for stoichiometric calculations, preparing solutions with precise concentrations, and determining molecular formulas from mass spectrometry data.

4. Using the Calculator

Tips: Enter the chemical formula using standard notation (e.g., H2O for water, C6H12O6 for glucose). The calculator will parse the formula and sum the exact atomic masses.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between exact and average molar mass?
A: Exact molar mass uses the most precise atomic masses for each isotope, while average molar mass accounts for natural isotopic abundance.

Q2: How are parentheses handled in formulas?
A: This calculator currently doesn't support parentheses in formulas (e.g., (NH4)2SO4). For such formulas, expand them manually (N2H8SO4).

Q3: What elements are supported?
A: The calculator supports common elements up to calcium. More elements can be added to the atomic mass database as needed.

Q4: How precise are the calculations?
A: Calculations use IUPAC-recommended atomic masses and are precise to 4 decimal places.

Q5: Can I use this for isotopic calculations?
A: No, this calculator uses natural abundance atomic masses. For isotopic calculations, you'd need to specify exact isotopes.