Millimoles of Oxalate, C2O4^2- ? ? ? Mass of Oxalate, C2O4^2- ? ? ? Percent Oxalate, C2O4^2- ? ? ?

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Chemistry 

Analysis of Oxalate Complex or Unknown

(The unknown oxalate titration will use the same reaction as Part B. The theoretical % oxalate of your samples are 52%)  
2MnO41- (aq) + 5C2O42- (aq) + 16H1+ (aq) à 10CO2 (g) + 8H2O (l) + 2Mn2+ (aq)

mMoles of KMnO4: Trial 1= 0.0323 Trial 2= 0.0208 Trial 3: 0.0303

Mass of Sample Trial 1 Trial 2 Trial 3
Weighing bottle Initial mass 163.757g 129.203g 167.423g
Weighing bottle Final mass 163.970g 129.458g 167.630g
Mass of Sample 0.213g 0.255g 0.207g
Titration      
Final reading 41.98mL 15.51mL 32.90mL
Initial reading 26.50mL 0.90mL 15.51mL
Volume of KMnO4 15.48mL 14.61mL 17.39mL
Calculations      
Millimoles of Oxalate, C2O4^2- ? ? ?
Mass of Oxalate, C2O4^2- ? ? ?
Percent Oxalate, C2O4^2- ? ? ?

The answer to some of the question marks have to be one of these, I'm having a hard time with this.

-mMoles of Oxalate, C2O4^2- in trials 1,2, and 3
1. 1.12
2. 1.33
3. 1.18
4. 2.03

The answer the other question marks have to be one of these

-% Oxalate, C2O4^2- in trials 1,2 and 3
1. 48.8
2.48.0
3.56.6
4. 38.6

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