NBNumbarn

Chemistry tools

Explore the periodic table, build formulas, and get approximate molar mass — with optional mass-to-moles.

Math lab · Physics

Supports parentheses and brackets: Fe4(Fe(CN)6)3, Mg(NO3)2.

Molar mass (approx.)

74.0920 g/mol

Mass percent by element

  • Ca54.09% (40.078 g/mol)
  • H2.72% (2.016 g/mol)
  • O43.19% (31.998 g/mol)

Periodic table

AlkaliAlkalineTransitionPost‑transitionMetalloidNonmetalHalogenNobleLanthanideActinide