2011 2012 pretest for percent yield, empirical and molecular formulas

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2011 2012 pretest for percent yield, empirical and molecular formulas

  1. 1. 2011-2012 Empirical Formula, Molecular Formula and Percent Yield Pretest1a. Write the equation for the reaction of iron (III) phosphate with sodium sulfate to make iron (III) sulfate and sodiumphosphate.1b. If I perform this reaction with 25 grams of iron (III) phosphate and an excess of sodium sulfate, how many grams of iron (III)sulfate can I make?1c. If 18.5 grams of iron (III) sulfate are actually made when I do this reaction, what is my percent yield?1d. Is the answer from problem #3 reasonable? Explain.2. What is the empirical formula for P4H10 ?3. A compound has an empirical formula of C3H5O2 and a molar mass of 146.14 grams. What is the molecular formula of thiscompound?4. Calculate the molecular formula of a compound that is 21.10% N, 6.06% H, 24.30% S and 48.45% O if the molarmass is 396 g/mol.5. Calculate the empirical formula of a compound that is 37.70% Na, 22.95, Si, and 39.34% O.

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