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1. What is the formula of a compound if a sample of the compoundcontains 0.537 mol X, 0.358 mol Y, and 0.895 mol Z?

2. What is the empirical formula of a compound that is 56.95% Cu,14.37% S, and 28.68% O? Write the elements in the order Cu, S, andO.
A 2.218-g sample of an oxide of Ru contains 1.792 g Ru. Whatis the empirical formula of the oxide?

3. What is the empirical formula of a hydrocarbon if completecombustion or 7.000 mg of the hydrocarbon produced 22.781 mg ofCO2 and 6.994 mg of H2O? Be sure to write Cfirst in the formula. What is the molecular formula if the molar mass of the hydrocarbon is found to be about 140molecular formula

4. What is the atomic mass of element X if 3.70 g XCl3contains 1.10 g X?

5. What is the mass percent of sulfur inNa2S2O3?

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Category:- Chemistry
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