The mineral iron pyrite (FeS2), typically, has a mass percentage of what is known as fool’s gold of 90-95%. The actual percentage in a sample can be determined using gravimetric analysis. To find the % mass of FeS2 the sulphur in FeS2 is firstly converted to sulphate (SO42-). These sulphate ions (SO42-) is mixed with an excess of barium chloride (BaCl2) to form barium sulphate (BaSO4), according to the following reaction:                                     Ba2+(aq) + SO42- (aq) à BaSO4 (s) When the reaction has gone to completion, the BaSO4 precipitate is collected in a filter paper and carefully washed. The filter paper and its contents are then transferred to a crucible. The crucible and its contents are heated until constant mass is achieved. The data for the analysis of a mineral sample is shown in the table below:  Initial Mass of mineral sample 17.5 g Mass of crucible and filter paper 144.60 g Mass of crucible, filter paper and dry BaSO4 196.89 g Molar mass FeS2 120.0 g/mol Molar mass BaCl2 208.3 g/mol Molar mass BaSO4 233.4 g/mol   Using this information available in the table, calculate the percentage by mass of iron pyrite FeS2 in this mineral sample, by answering the following questions:   (a) Balance the following reactions:                                                                                  2 FeS2 + H2SO4 → Fe2(SO4)3 + SO2 + H2O                             (Reaction 1) Fe2(SO4)3 + BaCl2 → BaSO4 + FeCl3                                     (Reaction 2)

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The mineral iron pyrite (FeS2), typically, has a mass percentage of what is known as fool’s gold of 90-95%. The actual percentage in a sample can be determined using gravimetric analysis.

To find the % mass of FeS2 the sulphur in FeS2 is firstly converted to sulphate (SO42-). These sulphate ions (SO42-) is mixed with an excess of barium chloride (BaCl2) to form barium sulphate (BaSO4), according to the following reaction:

                                    Ba2+(aq) + SO42- (aq) à BaSO4 (s)

When the reaction has gone to completion, the BaSO4 precipitate is collected in a filter paper and carefully washed. The filter paper and its contents are then transferred to a crucible. The crucible and its contents are heated until constant mass is achieved.

The data for the analysis of a mineral sample is shown in the table below: 

Initial Mass of mineral sample

17.5 g

Mass of crucible and filter paper

144.60 g

Mass of crucible, filter paper and dry BaSO4

196.89 g

Molar mass FeS2

120.0 g/mol

Molar mass BaCl2

208.3 g/mol

Molar mass BaSO4

233.4 g/mol

 

Using this information available in the table, calculate the percentage by mass of iron pyrite FeS2 in this mineral sample, by answering the following questions:

 

(a) Balance the following reactions:                                                                                 

2 FeS2 + H2SO4 → Fe2(SO4)3 + SO2 + H2O                             (Reaction 1)

Fe2(SO4)3 + BaCl2 → BaSO4 + FeCl3                                     (Reaction 2)

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(b) Find the mass of barium sulphate (BaSO4) from the data given in the table.                    

 

         (c) Calculate the moles of barium sulphate (BaSO4)                                                           

 

 

 

 

 

 

(d) Using stoichiometry for the balanced reactions, Reaction 1 and Reaction 2 from part (a), find the moles of FeS2                                                                                                                  

 

 

 

 

 

 

 

 

 

 

(e) Calculate the theoretical mass of FeS2 using your answer for moles FeS2 in part (d) 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(f) Calculate % mass iron pyrite FeS2 using the theoretical mass and the initial mass of mineral sample. How does your calculated % mass iron pyrite FeS2 compare to the typical 90-95% mass?

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