In order to determine the masses of reactants consumed in a reaction, as well as the masses of products formed, we need to use molar masses AND reaction coefficients. The coefficients in a balanced chemical equation tells us this information directly.īut what about the third relationship? Considering the mass relationship values given in the table for the methane combustion example, how did we know that 16 grams of methane reacts with 64 grams of oxygen? This information is not readily available just by looking at the balanced chemical equation. How many grams of substances react with each other to form productsįor the first two relationships listed above, it is easy to see how this information comes directly from a balanced chemical equation.How many moles of substances react with each other to form products.How many molecules, atoms, ions react with each other to form products.We’ve seen how the stoichiometry of a chemical reaction gives us many useful ways to think of the relative quantities involved: ? total grams of reactants = ? total grams of products Stoichiometry and Molar Masses *You should verify for yourself the conservation of mass for this reaction:
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