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The atoms in H2(g), O2(g), O3(g), Fe(s), and S8(s) all have an oxidation number of zero. ■ The oxidation state of a monatomic (one atom) ion is its charge. NaCl: Na is ϩ1 and Cl is Ϫ1. ZnS: Zn is ϩ2 and S is Ϫ2. ■ Oxygen has a Ϫ2 oxidation state in compounds, except hydrogen peroxide (H2O2), where O is Ϫ1. SO2; O is Ϫ2. Consequently, S is ϩ4. N2O5; O is Ϫ2. Consequently, N is ϩ5. H2O2; O is Ϫ1 and H is ϩ1. Practice Assign the oxidation state for each element in the following molecules. 26. 27. 28.
8. 9. 04 g oxygen in a sample. An empirical formula is the simplest whole-number ratio of atoms in a molecule. Glucose (C6H12O6) has an empirical formula of CH2O. For an unknown compound, the empirical formula can be calculated if the mass of each element is known or if the percent of each element is known. 86% hydrogen. 86 g hydrogen. 00 g Because the lowest whole-number ratio is required, divide all moles by the lowest. 69. 667O is not a valid formula. A multiplier must be used to create a whole-number ratio.
When a substance is dissolved in water, an aqueous solution is formed. An aqueous solution is a homogeneous mixture of a substance with water as the solvent. 1 Water 39 – AQUEOUS REACTIONS – are strong electrolytes, and weak acids and bases are weak electrolytes. ” Soluble salts are also strong acids. 1 can determine when a substance is soluble. What happens if solid lead (II) nitrate, Pb(NO3)2, is placed in water? According to the solubility table, nitrate compounds are soluble with no exceptions, so lead (II) nitrate would separate into its ions Pb2ϩ and NO3Ϫ.