Since the oxidation state of oxygen increases from -2 to 0, hence it is oxidized.Īccording to the oxidation states calculated in Step 1, oxidation state of chlorine changes from +5 to -1 from reactants to products. Oxidation means that the oxidation state on that element increases when it goes from reactant to product side. Similarly, the oxidation state of Cl in KCI is also calculated.Īccording to the oxidation states calculated in Step 1, oxidation state of oxygen changes from -2 to 0 from reactants to products. Therefore, the oxidation state for Cl is calculated by adding the oxidation states of K and O and equating it to the charge on which is neutral. Moreover, oxygen belongs to group VIA, hence, its oxidation state is -2. Oxidation state of elements on each side of the equation are as follows:įor, since potassium belongs to group IA in the periodic table, its oxidation state is +1. The oxidation state of O in the product - is 0. The oxidation states of elements of the product - KCI are: The oxidation states of elements of the reactant - are: Reduction: It means that if an element gains an electron, or loses oxygen during a reaction then it is said to be reduction and that element is said to be reduced. Oxidation: It means that if an element loses an electron, or gains oxygen during a reaction then it is said to be oxidation and that element is said to be oxidized. The oxidation state of elements has to be found out either by looking into its group number the periodic table or by calculating it through summing up the oxidation states of all the elements in that compound and equating it to the charge present on it. In the given question, a reaction is given. Which element is oxidized? Which element is reduced? For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.For the following reaction KClO3->KCl+3/2 O2 assign oxidation states to each element on each side of the equation…reactants and products. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. These relative weights computed from the chemical equation are sometimes called equation weights. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.įormula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. This site explains how to find molar mass.įinding molar mass starts with units of grams per mole (g/mol). The reason is that the molar mass of the substance affects the conversion. To complete this calculation, you have to know what substance you are trying to convert. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.Ī common request on this site is to convert grams to moles. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
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