The chemical formula for nicotine sulfate is C10H14N2•H2SO4. This formula represents the molecular structure of nicotine sulfate, which is formed by combining nicotine, a natural alkaloid found in tobacco plants, with sulfuric acid (H2SO4). In the formula, "C" represents carbon atoms, "H" represents hydrogen atoms, "N" represents nitrogen atoms, and "S" represents sulfur atoms. The dot (•) indicates that the nicotine molecule is combined with one molecule of sulfuric acid. This combination results in the formation of nicotine sulfate, a chemical compound commonly used as an insecticide in agriculture and horticulture.