It’s important because in a chemical reaction, the quantity of each element does not change (the law of conservation of mass). This means looking for stoichiometric coefficients for the reactants and products. So, the first step in stoichiometry calculations is balancing chemical equations. Knowing the molecular weight of the compounds involved in the reaction, it is easy to find the mass of these compounds in grams. For any balanced chemical equation, whole numbers (stoichiometric coefficients) are used to show the amounts (in moles) of both the reactants and products. Stoichiometry is the field of chemistry that studies the relative amounts of reactants and products in chemical reactions. You can enter either the required number of moles or weight in grams for one of the compounds in the corresponding field, and then press the ‘Enter’ key, to compute new values for the rest of the compounds. The reaction stoichiometry is calculated automatically for a balanced equation, with the number of moles for the compounds being the same as the stoichiometric coefficients. In what follows is a more detailed syntax guide to our calculator. ) or the asterisk (*) precedes the water formula (e.g.H₂O) are supported and automatically converted to normal form. H 2O) as well as denoted using the ‘tiny’ numbers, like ₂ or ₅, (e.g. Indices denoted using and html tags (e.g. You can enter a chemical equation manually or paste the equation copied from a web page or text document (including DOC or PDF file). In case the original equation was unbalanced, the field with this equation is highlighted in light pink. The equations may include free electrons and electrically charged molecules (ions) as well as hydrated compounds. You can verify these results with our chemical equation balancer.This online Stoichiometry Calculator finds the stoichiometric coefficients to balance a given chemical equation and computes amounts of the reactants and products of the reaction, both in moles and grams. So, the equation is balanced now with the same number of each type of atom on both sides. To balance hydrogen, add a coefficient of 2 in front of H2O:įinally, check and balance the oxygens by adding a coefficient of 2 in front of O2: Now, the carbons are balanced, but the hydrogens and oxygens are not. Oxygen (O): 2 on the left, 3 on the rightĪs we see number of atoms of carbon is already balanced in the above unbalanced equation.Hydrogen (H): 4 on the left, 2 on the right.Carbon (C): 1 on the left, 1 on the right.Let's balance the equation for the combustion of methane (CH4) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). That's how you balance the equation! Example: Repeat the second step: Adjust the coefficients until the number of atoms is the same on both sides.Adjust the numbers (coefficients) in front of one substance.Count the atoms on both sides of the equation.How to Balance Chemical Equations?Īn unbalanced chemical equation could be balanced by following these steps: This balancing process involves applying principles of stoichiometry, where the coefficients in the balanced equation not only represent the relative amounts of reactants and products but also convey the mole ratios between them. It ensures that the fundamental law of conservation of mass is maintained, which states that the quantity of each element is the same before and after the reaction occurs. Also, separate molecules and atoms contained within the given equationĪ balanced chemical equation is a representation of a chemical reaction that shows the exact numbers of atoms or molecules involved in the reaction on both the reactant and product sides.
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