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General Chemistry Principles, Patterns, and Applications, 2011

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13. Under the proper conditions, ammonia <strong>and</strong> oxygen will react to form dinitrogen monoxide (nitrous oxide,<br />

also called laughing gas) <strong>and</strong> water. Write a balanced chemical equation for this reaction. Determine which<br />

reactant is in excess for each combination of reactants.<br />

a. 24.6 g of ammonia <strong>and</strong> 21.4 g of oxygen<br />

b. 3.8 mol of ammonia <strong>and</strong> 84.2 g of oxygen<br />

c. 3.6 × 10 24 molecules of ammonia <strong>and</strong> 318 g of oxygen<br />

d. 2.1 mol of ammonia <strong>and</strong> 36.4 g of oxygen<br />

14. When a piece of zinc metal is placed in aqueous hydrochloric acid, zinc chloride is produced, <strong>and</strong> hydrogen<br />

gas is evolved. Write a balanced chemical equation for this reaction. Determine which reactant is in excess<br />

for each combination of reactants.<br />

a. 12.5 g of HCl <strong>and</strong> 7.3 g of Zn<br />

b. 6.2 mol of HCl <strong>and</strong> 100 g of Zn<br />

c. 2.1 × 10 23 molecules of Zn <strong>and</strong> 26.0 g of HCl<br />

d. 3.1 mol of Zn <strong>and</strong> 97.4 g of HCl<br />

15. Determine the mass of each reactant needed to give the indicated amount of product. Be sure that the<br />

chemical equations are balanced.<br />

a. NaI(aq) + Cl 2 (g) → NaCl(aq) + I 2 (s); 1.0 mol of NaCl<br />

b. NaCl(aq) + H 2 SO 4 (aq) → HCl(g) + Na 2 SO 4 (aq); 0.50 mol of HCl<br />

c. NO 2 (g) + H 2 O(l) → HNO 2 (aq) + HNO 3 (aq); 1.5 mol of HNO 3<br />

16. Determine the mass of each reactant needed to give the indicated amount of product. Be sure that the<br />

chemical equations are balanced.<br />

a. AgNO 3 (aq) + CaCl 2 (s) → AgCl(s) + Ca(NO 3 ) 2 (aq); 1.25 mol of AgCl<br />

b. Pb(s) + PbO 2 (s) + H 2 SO 4 (aq) → PbSO 4 (s) + H 2 O(l); 3.8 g of PbSO 4<br />

c. H 3 PO 4 (aq) + MgCO 3 (s) → Mg 3 (PO 4 ) 2 (s) + CO 2 (g) + H 2 O(l); 6.41 g of Mg 3 (PO 4 ) 2<br />

17. Determine the percent yield of each reaction. Be sure that the chemical equations are balanced. Assume that<br />

any reactants for which amounts are not given are in excess. (The symbol Δ indicates that the reactants are<br />

heated.)<br />

a. KClO3(s)→ΔKCl(s)+O2(g);2.14 g of KClO 3 produces 0.67 g of O 2<br />

Saylor URL: http://www.saylor.org/books<br />

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