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H 2 + Cl 2 2HCl Example 2: Na + H 2 O NaOH + H 2 In products (after hydrogen atom got balanced) Step 3- When hydrogen got balanced, now we have to check whether the number of atoms of chlorine is balanced. Step 2- Now, let us balance the hydrogen atom. Step 1- Write the number of atoms of each element in the unbalanced equation. In some cases, to show the reaction condition like temperature, pressure, catalyst, etc., they are indicated above and/or below the arrow in the equation. Unless it is necessary to specify the physical states of the elements, they are not included in a chemical equation. This indicates that in this reaction water is used in the form of steam. Here you can see that the symbol (g) is used for H 2O. Physical State of the elementģFe(s) + 4H 2O(g) Fe 3 O 4 (s) + 4H 2 (g) To make the equation more informative, the physical states of the reactant and product are mentioned along with their chemical formulae. Step7- We have to write the symbols of the physical states of each element in the equation. This method is also known as hit- and -trial method as we make trials to balance the equation. Thus, we get a balanced chemical equation. And that of hydrogen is 8 on both sides.The number of atoms of oxygen (O) is 4 on both sides.The number of atoms of Iron (Fe) is 3 on both sides.This you can check by counting the atoms of each element on both sides of the equation is equal. Step 6- At the end make sure that the equation is balanced. To make the iron atoms equal on both sides, we take three atoms of Fe on the reactant side. Step 5- Now that we have balanced both oxygen and hydrogen atoms, the only element left to be balanced is Iron (Fe). Here, to equalise the number of hydrogen atoms, we have to make the number of molecules of hydrogen as four on the product side. Balance the hydrogen atoms in the partly balanced equation. Step 4- To proceed further, we need to balance Fe and H atoms. You should keep in mind that while making the number of atoms equal, we cannot alter the formula of the compound or elements involved in the reaction. To balance the oxygen atoms on both sides- Atoms of oxygen There are four oxygen atoms on the product side and only one on the reactant side. If we consider this criterion, we take Fe 3O 4 and the element oxygen. Step 3- For balancing a chemical equation, it is more convenient if we start balancing with the compound that contains the maximum number of atoms. Step 2- Now write down the number of atoms of different elements present in the unbalanced equation i.e., here we list out the number of atoms of Iron (Fe), Hydrogen (H), and Oxygen (O). Step 1- To balance a chemical equation, draw boxes around each formula. Let us see the steps to be followed for writing a balanced chemical equation Balanced chemical equation is an equation in which the number of atoms for each element on the reactant side and product side is equal.