Stoichiometry
Calculation of relative masses of reactants and products in chemical reactions
Stoichiometry
Stoichiometry ( ) is the relationships between the quantities of reactants and products before, during and after chemical reactions. Stoichiometry is based on the law of conservation of mass; the total mass of reactants must equal the total mass of products, so the relationship between reactants and products must form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of the products can be empirically determined, then the amount of the other reactants can also be calculated. This is illustrated in the image here, where the unbalanced equation is: CH4 (g) + O2 (g) → CO2 (g) + H2O (l) However, the current equation is imbalanced. The reactants have 4 hydrogen and 2 oxygen atoms, while the product has 2 hydrogen and 3 oxygen. To balance the hydrogen, a coefficient of 2 is added to the product H2O, and to fix the imbalance of...
Read on Wikipedia · Image Jynto Robert A. Rohde Jacek FH Jynto, Public domain
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