Question

hc₂h₃o₂ + ca(oh)₂ → ca(c₂h₃o₂)₂ + h₂o

Explanation:

Step1: Balance the acetate ions

On the right - hand side, there are 2 acetate ions ($C_2H_3O_2^-$) in $Ca(C_2H_3O_2)_2$. So, we need 2 moles of $HC_2H_3O_2$ on the left - hand side.
$2HC_2H_3O_2+Ca(OH)_2
ightarrow Ca(C_2H_3O_2)_2 + H_2O$

Step2: Balance the hydrogen and oxygen atoms

In the reactants, we have 2 moles of $HC_2H_3O_2$ which contribute 2 extra hydrogen atoms, and 1 mole of $Ca(OH)_2$ which has 2 hydrogen atoms from the hydroxide group. In total, there are 4 hydrogen atoms from non - water sources. On the right - hand side, for the hydrogen and oxygen atoms to be balanced, we need 2 moles of $H_2O$.
$2HC_2H_3O_2 + 1Ca(OH)_2
ightarrow1Ca(C_2H_3O_2)_2+2H_2O$

Answer:

2, 1, 1, 2