Question

consider these intermediate chemical equations.
2p (s) + 3cl₂ (g) → 2pcl₃ (l)
pcl₃ (l) + cl₂ (g) → pcl₅ (s)
when you combine the intermediate chemical equations, which substance do you cancel out?
pcl₅
cl₂
pcl₃
p

Explanation:

In the first equation, $PCl_3$ is a product. In the second equation, $PCl_3$ is a reactant. When combining the equations, substances that appear as a product in one and a reactant in the other can be canceled out.

Answer:

$PCl_3$