# 6: Introduction to Stoichiometry

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In this chapter, we will be combining ideas about the mole concept and about balanced chemical equations which we had previously looked at in earlier chapters. It is assumed you have already mastered the mole concept and the balanced chemical equation concept prior to beginning this chapter. To check your knowledge, you might want to try each of the following practice problems before continuing in this chapter. If you find these challenging, please go back and review the relevant chapter before continuing with this chapter.

##### Example $$\PageIndex{1}$$

How many molecules is $$40.0 \: \text{g}$$ of chlorine gas, $$\ce{Cl_2}$$?

##### Example $$\PageIndex{2}$$

How many hydrogen atoms and hydrogen molecules are there in the following balanced equation?

C(s)+2H2(g)→CH4(g)

Additionally, as was the case in the chapter on moles, the concepts in this chapter will build on each other as you move from section to section. Because of this, you will need to master each section before moving on to the next section. In the final section of this chapter, we introduce additional stoichiometry concepts which will be revisited again in a later chapter.