Homework Help Forum: stoichiometry

Posted by Laura on Friday, September 11, 2009 at 12:48am.

if 5.00g magnesium is combined with 10.0 g of chlorine, show by calculation which substance is the limiting reactant and calculate the theoretical yield of magnesium chloride for the reaction. Someone PLEASE HELP ME!!!!

• stoichiometry - pop, Friday, September 11, 2009 at 10:16am

  Mg + Cl2 -> MgCl2 5.00 g Mg / 24 g/mol / 1 (from balanced equation) = 0.21 10.0 g Cl2 / 71 g/mol / 2 (from balanced equation) = 0.070 Smallest number is limiting reactant = Cl2 Yield = 10.0 g Cl2 / 71g/mol X 1 mol MgCl2/1 mol Cl2 X 95 g MgCl2/mol = 13.4 g

  
  

  • stoichiometry - pop, Friday, September 11, 2009 at 10:19am

    10 g Cl2 / 71 g/mol /1 (balanced equation) = 0.141 Still the limiting reactant\ MgCl2 is still 13.4 Sorry!

    
    

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