Physical chemistry

• Are Molecular Mass and Molecular Weight the Same?
  Molecular mass and molecular weight are often used interchangeably in chemistry, but molecular mass, relative molecular mass, and molar mass mean different things.
• How to Read the Potential Energy Graph of the Hydrogen Molecule
  The H₂ potential energy curve explained. The minimum marks the 74 pm bond length, its depth the bond energy, and repulsion dominates at short range.