Type a chemical formula —H2SO4, Ca(OH)2, Fe2(SO4)3, CuSO4·5H2O, K4[Fe(CN)6]— and get its molar mass in g/mol, the percent composition by mass of each element and, if you give the sample mass, the moles and the number of formula units. Every step is explained: count the atoms, multiply by the atomic mass and add.
Atomic masses, ionization energies, melting points and names from Wikidata, public-domain data (CC0 1.0), checked one by one by Simuveliq. Atomic masses are the IUPAC standard ones.
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