Homework Help: chemistry

Posted by malissa on Tuesday, October 23, 2012 at 5:54pm.

A 3.75-G SAMPLE OF IRON ORE IS TRANSFORMED TO A SOLUTION OF IRON(II)SULFATE, FeSO4,AND THIS SOLUTION IS TITRATED WITH 0.150 M K2Cr2O7. IF IT REQUIRES 43.7 mL OF POTASSIUM DICHROMATE SOLUTION TO TITRATE THE IRON(II)SULFATE SOLUTION, WHAT IS THE PERCENTAGE OF IRON IN THE ORE? THE REACTION IS
6FeSO4(aq)+K2Cr207(aq)+7H2SO4(aq)Би
3Fe2(SO4)3(aq)+Cr2(SO4)3(aq)+7H2O(l)+K2SO4(aq)

chemistry - DrBob222How, Tuesday, October 23, 2012 at 7:52pm
mols dichromate = M x L = ?
Use the coefficients in the balanced equation to convert mols dichromate to mols FeSO4
Convert mols FeSO4 to mols Fe then to grams Fe. g Fe = mols Fe x atomic mass Fe.
%Fe = (mass Fe/mass sample)*100 = ?
chemistry - Geovanna, Tuesday, November 6, 2012 at 11:19pm
62.81%

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