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). The exact molar mass is calculated using the exact atomic masses of isotopes rather than average atomic weights.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( MW \) — Molar mass (g/mol)
• exact atomic masses — Precise isotopic masses from IUPAC data
• counts — Number of each atom in the molecule

Explanation: The calculator parses the chemical formula, identifies each element and its count, then sums the exact isotopic masses multiplied by their counts in the molecule.

3. Importance of Exact Molar Mass

Details: Exact molar mass is crucial for precise chemical calculations, mass spectrometry, and analytical chemistry where isotopic distributions matter.

4. Using the Calculator

Tips: Enter the chemical formula using standard notation (e.g., H2O, C6H12O6). Parentheses and subscripts are supported for complex formulas.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between average and exact molar mass?
A: Average molar mass uses weighted averages of naturally occurring isotopes, while exact molar mass uses precise masses of specific isotopes.

Q2: How accurate is this calculator?
A: When fully implemented with IUPAC isotopic mass data, it provides exact molar mass values accurate to several decimal places.

Q3: Does it work for ions and charged species?
A: The calculator computes neutral molecular masses. For ions, you would need to account for electron mass separately.

Q4: What elements are supported?
A: The calculator should support all stable elements and their natural isotopes when fully implemented.

Q5: Can it handle complex formulas?
A: Yes, with proper implementation it can handle formulas with parentheses, subscripts, and complex stoichiometry.