# Chapter 3 - Chemical Reactions - Questions for Review and Thought - Topical Questions - Page 148b,: 18

$X_2+Y_2-->XY_2+X$

#### Work Step by Step

First, we try to match the drawing with the chemical reaction, which is above. Next, we count the molecules. We see that there are 6 of each molecule. Thus, we know that we must put a 6 in front of every molecule in the reaction.

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