The chemical equations below show reactions similar to those you have met already. One of them is balanced correctly, and three are not. Identify which one is correctly balanced. State why.  - 4 Fe (s) + 3 O2 (g) = 2 Fe2O3 (s) - Mg (s) + O2 (g) = 2 MgO (s) - 2 K (s) + 2 O2 (g) = 2 K2O (s) - 2 Na (s) + H2O (l) = 2 NaOH + H2 (g)

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".