Question

hcl + caco₃ → cacl₂ + h₂o + co₂. when you have an upset stomach and you take an antacid, this unbalanced reaction occurs. what set of coefficients will balance this equation? a 1,1,1,1,1 b 2,3,3,1,3 c 2,1,1,1,1 d 2,2,2,1,3

Explanation:

Step1: Balance chlorine atoms

On the right - hand side, there are 2 chlorine atoms in $CaCl_2$. So, we need 2 moles of $HCl$ on the left - hand side to balance the chlorine atoms. The equation becomes $2HCl+CaCO_3
ightarrow CaCl_2 + H_2O+CO_2$.

Step2: Check other atoms

For calcium, there is 1 calcium atom on both sides. For carbon, there is 1 carbon atom on both sides. For oxygen, there are 3 oxygen atoms on the left - hand side ($CaCO_3$ has 3 oxygen atoms) and 1 oxygen atom in $H_2O$ and 2 oxygen atoms in $CO_2$ on the right - hand side, which is balanced. For hydrogen, there are 2 hydrogen atoms on both sides.

Answer:

C. 2,1,1,1,1