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220 Chapter 4 Stoichiometry of Chemical Reactions (c) SeO2 (d) KNO2 (e) In2S3 (f) P4O6 18. Determine the oxidation states of the elements in the compounds listed. None of the oxygen-containing compounds are peroxides or superoxides. (a) H2SO4 (b) Ca(OH)2 (c) BrOH (d) ClNO2 (e) TiCl4 (f) NaH 19. Classify the following as acid-base reactions or oxidation-reduction reactions: (a) Na2 S(aq) + 2HCl(aq) ⟶ 2NaCl(aq) + H2 S(g) (b) 2Na(s) + 2HCl(aq) ⟶ 2NaCl(aq) + H2(g) (c) Mg(s) + Cl2(g) ⟶ MgCl2(s) (d) MgO(s) + 2HCl(aq) ⟶ MgCl2(aq) + H2 O(l) (e) K3 P(s) + 2O2(g) ⟶ K3 PO4(s) (f) 3KOH(aq) + H3 PO4(aq) ⟶ K3 PO4(aq) + 3H2 O(l) 20. Identify the atoms that are oxidized and reduced, the change in oxidation state for each, and the oxidizing and reducing agents in each of the following equations: (a) Mg(s) + NiCl2(aq) ⟶ MgCl2(aq) + Ni(s) (b) PCl3(l) + Cl2(g) ⟶ PCl5(s) (c) C2 H4(g) + 3O2(g) ⟶ 2CO2(g) + 2H2 O(g) (d) Zn(s) + H2 SO4(aq) ⟶ ZnSO4(aq) + H2(g) (e) 2K2 S2 O3(s) + I2(s) ⟶ K2 S4 O6(s) + 2KI(s) (f) 3Cu(s) + 8HNO3(aq) ⟶ 3Cu(NO3)2(aq) + 2NO(g) + 4H2 O(l) 21. Complete and balance the following acid-base equations: (a) HCl gas reacts with solid Ca(OH)2(s). (b) A solution of Sr(OH)2 is added to a solution of HNO3. 22. Complete and balance the following acid-base equations: (a) A solution of HClO4 is added to a solution of LiOH. (b) Aqueous H2SO4 reacts with NaOH. (c) Ba(OH)2 reacts with HF gas. This content is available for free at http://cnx.org/content/col11760/1.9PDF Image | Stoichiometry of Chemical Reactions
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