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Ch.3 - Chemical Reactions and Reaction Stoichiometry
All textbooksBrown 14th EditionCh.3 - Chemical Reactions and Reaction StoichiometryProblem 17
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Chapter 3, Problem 17

(a) When the metallic element lithium combines with the nonmetallic element chlorine, Cl2(g), what is the chemical formula of the product? (b) In the balanced chemical equation for this reaction, what is the coefficient in front of the product if the coefficient in front of Cl2(g) is 1?

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1
Identify the valency of lithium (Li) and chlorine (Cl). Lithium is in Group 1 and has a valency of +1, while chlorine is in Group 17 and has a valency of -1.
Determine the chemical formula of the compound formed by lithium and chlorine. Since lithium has a +1 charge and chlorine has a -1 charge, they combine in a 1:1 ratio to form LiCl.
Write the unbalanced chemical equation for the reaction: Li(s) + Cl_2(g) → LiCl.
Balance the chemical equation. Since Cl_2 contains two chlorine atoms, you need two LiCl to balance the chlorine atoms: 2 Li(s) + Cl_2(g) → 2 LiCl.
Identify the coefficient in front of the product LiCl in the balanced equation. The coefficient is 2.
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