Question

caco₃ → cao + co₂

Explanation:

Step1: Apply mass - conservation principle

In a chemical equation, the number of atoms of each element on the reactant side must equal the number of atoms of the same element on the product side. For the decomposition of calcium carbonate ($CaCO_3$) into calcium oxide ($CaO$) and carbon dioxide ($CO_2$), we check the atoms of calcium ($Ca$), carbon ($C$), and oxygen ($O$).
The number of calcium atoms: 1 in $CaCO_3$, 1 in $CaO$ and 0 in $CO_2$.
The number of carbon atoms: 1 in $CaCO_3$, 0 in $CaO$ and 1 in $CO_2$.
The number of oxygen atoms: 3 in $CaCO_3$, 1 in $CaO$ and 2 in $CO_2$.

Step2: Determine the coefficients

Since the number of atoms of each element is already balanced without the need for any non - one coefficients, the balanced chemical equation is $1CaCO_3
ightarrow1CaO + 1CO_2$.

Answer:

1, 1, 1