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To enter formulas:

H.2O.4 - 2 Hydrogen, 4 Oxygen
H.2+O->H.2O - 2 Hydrogen + Oxygen = Water
More Help
For a Molecule:
[{Moles(number)}]{Elements}
For an Element:
{ElementSymbol}[.{TimesElement(number)}]
To join multiple elements use a '+' sign.
Use -> to seperate product and reactants
Use one or more molecues before an -> sign, and one or more after the -> sign.
If you just want one molecue/element- type out that element (ie. H2)
... (can repeat)