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Question

How to balance this chemical equation?

Potassium metal and chlorine gas combine to form Potassium chloride.


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Solution

Balancing chemical equation:

The given equation is; K(s)Potassium+Cl2(g)ChlorineKCl(s)Potassiumchloride

Steps to balance the equation:

Step 1: Write the unbalanced Chemical Equation

Let us consider the unbalanced equation : K(s)Potassium+Cl2(g)ChlorineKCl(s)Potassiumchloride

Step 2: Write down the number of atoms

Write down the number of atoms of each element present on both reactant as well as product side

AtomReactant sideProduct side
K11
Cl21

Step 3: Add coefficients to balance mass in a chemical equation

  • First balance Chlorine and then Potassium by trial and error method.
  • Add a stoichiometric coefficient of 2 on the product side to first balance the Chlorine atoms.
  • Then for balancing the K atoms, we have to add a stoichiometric coefficient of 2 on the reactant side and it will balance the whole reaction given by; 2K(s)+Cl2(g)2KCl(s)

Hence, by balancing the given equation by hit and trial method we will get : 2K(s)+Cl2(g)2KCl(s)


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