Question

what is the missing coefficient to make a balanced equation? ?kclo₃ → kcl + o₂ be sure the equation is balanced before entering the coefficients. 4 2 1 3

Explanation:

Step1: Balance oxygen atoms

We know that in $KClO_3$, there are 3 oxygen atoms per formula - unit and in $O_2$, there are 2 oxygen atoms per molecule. The least - common multiple of 3 and 2 is 6. So, we need 2 $KClO_3$ to have 6 oxygen atoms on the left - hand side and 3 $O_2$ to have 6 oxygen atoms on the right - hand side.

Step2: Balance potassium and chlorine atoms

If we have 2 $KClO_3$, then we have 2 potassium (K) and 2 chlorine (Cl) atoms on the left - hand side. So, we need 2 $KCl$ on the right - hand side to balance the potassium and chlorine atoms. The balanced equation is $2KClO_3
ightarrow2KCl + 3O_2$.

Answer:

2