Consider these intermediate chemical equations. 2 cap p s plus 3 Cl sub 2 g rightarrow 2 PCl sub 3 l PCl sub 3 times l plus Cl sub 2 times g rightarrow PCl sub 5 times s When you combine the intermediate chemical equations, which substance do you cancel out?

PCl₃ is produced in the first equation and consumed in the second, so it is an intermediate substance. Multiply the second equation by 2 so that its 2 PCl₃ matches the 2 PCl₃ produced in the first equation; they cancel when the equations are added. The substance canceled is PCl₃.

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