A level chemistry amount of substance question help

Tanyme

Hey, can someone post a worked out solution to this question. Thanks.

Reply 1

Tanyme

Problem 33 plz thanks!

Problem 33

Original post by Tanyme

Hey, can someone post a worked out solution to this question. Thanks.

Unfortunately, we aren’t allowed to give full worked solutions. What I can do, however, is give you some prompts.

They’ve given you the equation 4FeS2 + 11O2 —> 2Fe2O3 + 8SO2

They’ve asked for the masses of Fe2O3 and SO2 you can make when 1 tonne of a rock that is 50% FeS2 by mass undergoes this reaction.

(1) 1 tonne = 1 kilogram, so 50% of 1 tonne = how many kilograms?

(2) How many grams are in the number of kilograms you found in (1)?

(3) Using the given Ar values (Fe is 56 and S is 32), find the relative formula mass of FeS2. Can you now use this and your answer in (2) to find how many moles of FeS2 are in the rock?

(4) Using the equation, the ratio of FeS2 used to Fe2O3 made is 4:2 or 2:1. Can you use this to find the moles of Fe2O3 made?

(5) Again, using the Ar values, can you work out the relative formula mass of Fe2O3?

(6) Now using your answers to (4) and (5), find the mass of Fe2O3- this will be given in grams, so you may wish to convert it back to kg or tonnes.

(7) Using a similar process to that described in steps (4) to (6), can you now find the mass of SO2 produced?