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3 Stoichiometry Solutions to Exercises in a molecule. The composition of the different molecules, and CO, is different and the physical and chemical properties of the two compounds they constitute are very different. The subscript 2 changes molecular composition and thus properties of the compound. The prefix 2 indicates how many molecules (or moles) of the original compound are under consideration. (b) Yes. There are the same number and kinds of atoms on the reactants side and the products side of the equation. 3.11 (a) 2CO(g) + O₂(g) 2CO₂(g) (b) N₂O₅(g) + 2HNO₃(aq) (c) CH₄(g) + 4Cl₂(g) (d) + 4A1(OH)₃(s) (e) (f) 2Fe(OH)₃(s) + Fe₂(SO₄)₃(aq) + (g) Mg₃N₂(s) + 3.12 (a) 2Li₃N(s) (b) (c) 2NH₄NO₃(s) (d) 3Ca(OH)₂(aq) + 2PH₃(g) (e) 2A1(OH)₃(s) + + (f) 2AgNO₃(aq) + Na₂CO₃(aq) (g) 3.13 (a) CaC₂(s) + Ca(OH)₂(aq) + C₂H₂(g) (b) 2KClO₃(s) (c) Zn(s) + H₂SO₄(aq) H₂(g) + ZnSO₄(aq) (d) + (e) 3H₂S(g) + 2Fe(OH)₃(s) 3.14 (a) H₂SO₄(aq) (b) 2H₃BO₃(aq) (c) (d) 2Hg(NO₃)₂(s) (e) Cu(s) 41