Question

what is the missing coefficient to make a balanced equation? 2kclo₃ → ?kcl + o₂ 1 3 2 4

Explanation:

Step1: Balance potassium and chlorine

On the left - hand side, in $2KClO_3$, there are 2 potassium (K) and 2 chlorine (Cl) atoms. So, for the product $KCl$, the coefficient must be 2 to balance K and Cl atoms.

Step2: Balance oxygen

In $2KClO_3$, there are $2\times3 = 6$ oxygen atoms. In $O_2$, to have 6 oxygen atoms, the coefficient of $O_2$ should be 3 since $2\times3=6$. But we are asked for the coefficient of $KCl$, which is 2.

Answer:

2