A- Balance The Equation NO2(g) + H2O(1) -- HNO3(1) + NO(g) B- What is formula mass of K2Cr207 (O=16g/mol , Cr=52g/mol and K=39g/mol) C- Calculate the empirical formula of a C6H1206 that following present composition by mass: C=23.75%, H=37.5% and O=40% percent. (C-12g/mol, * H=1g/mol and O-16g/mol)

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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".