Zircon is a common substitute for diamond in inexpensive jewelry. The percent composition of zircon is 49.76% Zr, 15.32% Si, and the remainder oxygen. Determine the empirical formula of zircon.

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Asbestos was used for years as an insulating material in buildings until exposure to asbestos was found to cause lung cancer. Asbestos is a mineral containing magnesium, silicon, oxygen, and hydrogen. One form of asbestos, chrysolite, has the composition 26.31% Mg, 20.27% Si, 1.45% H, and the rest oxygen. Determine the empirical formula of chrysolite.  

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A candle flame produces easily seen specks of soot near the edges of the flame, especially when the candle is moved. A piece of glass held over a candle flame will become coated with soot, which is the result of the incomplete combustion of candle wax. Elemental analysis of the soot gave these results: 7.74% H and 92.26% C by mass. Determine the empirical formula of the compound. 

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The combustion of 40.5 mg of a compound containing C, H, and O, and extracted from the bark of the sassafras tree, produces 110.0 mg of CO₂ and 22.5 mg of H₂O. The molar mass of the compound is 162 g/mol. Determine the empirical and molecular formulas.

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