based on the chemical equation, use the drop - down menu to choose the coefficients that will balance the…

Explanation:

Step1: Balance sulfur atoms

On both sides of the equation, the number of sulfur atoms should be equal. Currently, there is 1 sulfur atom in $CaSO_4$ and 1 in $CaS$. So far, sulfur is balanced without adjusting coefficients for sulfur - containing compounds for now.

Step2: Balance oxygen atoms

Let the coefficient of $CaSO_4$ be $x$, the coefficient of $O_2$ be $y$, and the coefficient of $CaS$ be $z$. The number of oxygen atoms in $CaSO_4$ is $4x$, and in $O_2$ is $2y$. For calcium and sulfur, we know from the chemical formula that $x = z$. We want to balance oxygen: $4x=2y$. Let's start with the simplest non - zero integer values. If we set $x = 1$, then from $4x = 2y$, we get $y = 2$. And since $x = z$, $z = 1$. The balanced chemical equation is $1CaSO_4\rightarrow2O_2 + 1CaS$.

Answer:

The coefficients are 1, 2, 1.