How to balance this chemical equation? Potassium metal and chlorine gas combine to form potassium chloride.

The balanced equation is 2K(s) + Cl2(g)→2KCl(s)

  • There are two chlorine atoms on the left-hand side (LHS) and one chlorine atom on the right-hand side (RHS). Add a coefficient of 2 in front of KCl.

K(s) + Cl2(g)→2KCl

  • K is not balanced. There are two K atoms on the RHS, and only one on the LHS. Place a coefficient of 2 in front of K on the LHS.

2K(s) + Cl2(g)→2KCl(s)

  • Now 2 K atoms on both sides and two chlorine atoms on both sides. Hence balanced.

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