Molar Mass Calculator

Chemical Formula

Use standard chemical notation: H2O, CO2, CaCO3, etc.

Common Compounds

Quick Reference

Formula Guidelines

  • • Use standard element symbols (H, O, C, etc.)
  • • Numbers go after the element (H2, O2)
  • • Use parentheses for groups: Ca(OH)2
  • • Case sensitive: Co (cobalt) vs CO (carbon monoxide)
  • • No spaces in formula

Common Elements

H1.008
C12.01
N14.01
O16.00
Na22.99
Cl35.45
Ca40.08
Fe55.85

Applications

  • • Stoichiometry calculations
  • • Solution concentration
  • • Chemical reaction balancing
  • • Laboratory preparations
  • • Analytical chemistry

💡 Tips

  • • Double-check element symbols
  • • Count atoms carefully in complex formulas
  • • Use parentheses for polyatomic ions
  • • Remember subscripts multiply everything in parentheses

Understanding Molar Mass

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It equals the molecular weight of a compound.

To calculate molar mass, multiply the atomic mass of each element by the number of atoms of that element, then sum all the products.

Molar mass is essential for converting between moles and grams in chemical calculations and stoichiometry problems.

Chemical Formula Basics

Simple Compounds

  • • H₂O: 2 hydrogen + 1 oxygen
  • • CO₂: 1 carbon + 2 oxygen
  • • NaCl: 1 sodium + 1 chlorine
  • • CH₄: 1 carbon + 4 hydrogen

Complex Compounds

  • • Ca(OH)₂: 1 calcium + 2 oxygen + 2 hydrogen
  • • Al₂(SO₄)₃: 2 aluminum + 3 sulfur + 12 oxygen
  • • C₆H₁₂O₆: 6 carbon + 12 hydrogen + 6 oxygen
  • • Mg(NO₃)₂: 1 magnesium + 2 nitrogen + 6 oxygen

Molar Mass Calculator FAQ

Get answers to common questions about molar mass calculator