Transcription of Practice Problems (Chapter 5): Stoichiometry
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Practice Problems (Chapter 5): Stoichiometry
Practice Problems (Chapter 5): Stoichiometry CHEM 30A Part I: Using the conversion factors in your tool box 1. How many moles CH3OH are in g CH3OH? 2. What is the mass in grams of x 1016 atoms S? 3. How many molecules of CO2 are in g CO2? 4. What is the mass in grams of 1 atom of Au? KEY Tool Box: To convert between Use From g A mol A molar mass periodic table mol A particles A Avogadro s # memory mol A mol B molar ratio coeff. in bal. eqn. 1 mol S x 1023 atoms S x 1016 atoms S g S 1 mol S = x 10 7 g S 1 mol CH3OH g CH3OH g CH3OH = mol CH3OH CH3OH = 1( g/mol) + 4( g/mol) +1( g/mol) = g/mol CO2 = 1( g/mol) + 2( g/mol) = g/mol x 1023 molecules CO2 1 mol CO2 g CO
3 CO 2 + 4 H 2 O Part II: Stoichiometry problems 5. If 54.7 grams of propane (C 3 H 8) and 89.6 grams of oxygen (O 2) are available in the balanced combustion reaction to the right: a) Determine which reactant is the limiting reactant. b) Calculate the theoretical yield of CO 2 in grams.
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