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Molecular Weight Calculator

Calculate the breakdown of molar mass for any chemical formula instantly.

Molecular Weight Calculator

Calculate molar mass from chemical formula.

Case sensitive (e.g. Co vs CO). No parentheses.

Understanding the Molecular Weight & Molar Mass Calculator

Calculate the molecular weight (molar mass) of any chemical compound by entering its formula. Our tool breaks down the contribution of each element and provides a visual mass distribution chart.

Guide

How to use the Molecular Weight & Molar Mass Calculator

  • 1Enter the chemical formula (e.g., H2O, C6H12O6) in the input field.
  • 2Ensure correct capitalization: the tool treats 'Co' as Cobalt and 'CO' as Carbon Monoxide.
  • 3Click 'Calculate Mass' to see the result in grams per mole (g/mol).
  • 4Review the pie chart to see which elements contribute the most to the total weight.
Applications

Common Use Cases

Stoichiometry: Converting between mass (grams) and moles in chemical reactions.
Solution Preparation: Determining how much solute to weigh for a specific molarity.
Isotope Analysis: Calculating theoretical mass based on standard atomic weights.
Education: Visualizing the composition of complex molecules for students.

The Maths Behind the Calculation

MW = Σ (AtomicWeight_i × Count_i)

Molecular Weight (MW) is the sum of the atomic weights of all atoms in a molecule. For example, H2O consists of 2 atoms of Hydrogen (1.008 each) and 1 atom of Oxygen (15.999).

Knowledge Base

Frequently Asked Questions

What is the difference between Molecular Weight and Molar Mass?

While often used interchangeably, molecular weight is the mass of a single molecule (in amu), whereas molar mass is the mass of one mole of those molecules (in g/mol).

Why is capitalization important?

In chemistry, symbols start with a capital letter. 'Na' is Sodium, but 'na' would be invalid. 'CO' is Carbon and Oxygen, while 'Co' is Cobalt.

Are parentheses supported?

In this version, parentheses are not supported. Please expand your formula (e.g., use MgN2O6 instead of Mg(NO3)2).

Regional Notice: United States

"Federal tax estimates are based on 2024 brackets. Consult a tax professional for official filing."