3.stoichiometry key

3.stoichiometry key - Chem 105 Nielson Recitation 9/18/07...

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Chem 105 Nielson Recitation 9/18/07 Balancing equations Different types of reactions Formula weights Molar mass Mole % composition Empirical and molecular formulas Stoichiometry calculations Limiting reactants Percent Yield 1. Calculate the molar mass of CaCO 3 . Report your answer to 3 sig figs. 40.08 g/mol Ca 12.01 g/mol C 3 (16.00 g/mol) O 100.09 g/mol CaCO 3 Ans. 100. g/mol CaCO 3 2. Phosphorus, P 4 (s) and chlorine gas react in a combination reaction to produce PCl 3 (l). a. Write a balanced equation for the reaction. P 4 (s) + 6 Cl 2 (g) --------> 4 PCl 3 (l) b. How much chlorine, in grams, is necessary to completely react with a piece of phosphorus that weighs 1.45 g? Mw of P 4 = 123.9 g/mol, Mw of Cl 2 = 70.90 g/mol, Mw of PCl 3 = 137.3 g/mol 1.45 g P 4 x (1 mol P 4 /123.9 g P 4 ) x (6 mol Cl 2 /1 mol P 4 ) x (70.90 g Cl 2 /1 mol Cl 2 ) = 4.978 g Cl 2 Ans. 4.98 g Cl 2 3. A 10.45 g sample of bismuth combines with oxygen to produce 11.65 g of bismuth oxide. Determine the empirical formula of the oxide. This is a slightly different take on finding the empirical formula from % composition.
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This note was uploaded on 12/09/2009 for the course CHEM 105 taught by Professor Macedone during the Spring '07 term at BYU.

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3.stoichiometry key - Chem 105 Nielson Recitation 9/18/07...

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