chemistry

in an experiment, a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, unreacted aluminum remains, and this unreacted aluminum is consumed by reaction with excess hydrochloric acid. the resulting solution was decanted off and the deposited Fe metal was washed several times with water. the wet Fe was transferred to a clean, dry evaporating dish, which weighted 30.7310grams. after carefully evaporating the water, the dish and the iron residue was found to weigh 32.9150grams.

A. calculate the experimental percentage of iron in the iron chloride

B. determine the empirical formula of the iron chloride

  1. 👍 0
  2. 👎 0
  3. 👁 110
  1. Second try. My first one was deleted.
    32.9150g = mass dish + Fe
    -30.7310g = mass empty dish
    -------------
    +2.1840g = mass Fe
    %Fe = (mass Fe/mass Fe sample) = 2.1840/5.000)*100 = ? = approx 43.68%

    Note: I feel compelled to point out that this is a lousy procedure BECAUSE when the HCl is added to consume the unused Al metal, it will consume part of the solid Fe metal ALSO which means the results are low for the percentage of Fe.

    b) Take a 100 g sample which give you
    43.68 g Fe and
    100 - 43.68 = 56.32g Cl

    mols Fe = 43.68/55.85 = about 0.782
    mols Cl = 56.32/35.45 = about 1.59
    Divide both by the smaller of the two or
    0.782/0.782 = 1.00 and
    1.59/0.782 = 2.03 which I would round to 2 which makes the iron chloride empirical formula FeCl2.

    1. 👍 0
    2. 👎 0
  2. what is the balanced chemical equation and how do you find the percent yield of iron in the experiment?

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, unreacted

    asked by Anonymous on March 26, 2014
  2. Chemistry

    What is the molal concentration,m,of tin in a solution of 5.000grams of tin dissolved 95.000grams of copper

    asked by Ruffles on December 4, 2013
  3. Chem

    a 0.2000 grams sample of aluminum metal is added to a solution containing 1.0000grams of an unknown compound made of platinum and chloride ion. the reaction results in the formation of aluminum chloride and platinum metal. when

    asked by Carley on March 1, 2014
  4. chemistry

    a 0.2000 grams sample of aluminum metal is added to a solution containing 1.0000grams of an unknown compound made of platinum and chloride ion. the reaction results in the formation of aluminum chloride and platinum metal. when

    asked by Anonymous on March 3, 2014
  5. Chemistry

    1.) A 3.000gram sample of a hydrate compound containing Co, C2O4, and H2O was combusted to give 1.316g of Co3O4. What is the percentage of Cobalt in the oxide? 3.) 2.000 grams of a sample containing Co, C2O4, and H2O showed there

    asked by Robert on March 3, 2013
  6. chemistry

    .033597 grams of hydrogen is combined with 1.000grams of of carbon . calculate the atomic mass of hydrogen

    asked by walter H on February 24, 2015
  7. general chem

    Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, simply write NR. (a) Nickel metal is added to a solution of copper (II) nitrate; (b) a solution of zinc

    asked by rob on October 9, 2011
  8. Chemistry

    A 2.764 g sample containing only iron and aluminum metal was treated with acid to form Al(+3) and Fe(+2). The sample was then titrated with a potassium dichromate solution (only the Fe(II) will react with the dichromate). The

    asked by Jessica on October 16, 2014
  9. chemistry

    aluminum metal is added to a solution of cobalt (II) sulfate

    asked by Emily on December 3, 2018
  10. Chemistry

    Magnesium metal reacts with HCl solution, liberating H2 gas and generating Mg2+ cations in solution. A 2.970-g sample of Mg metal is added to 50.0 mL of a 4.00 M HCl solution, and the reaction goes to completion. How many grams of

    asked by Carolina on September 13, 2011

More Similar Questions