chemistry percentage yield questions aqa alevel

What is the percentage yield when 20 g of aluminium are produced from 50 g of aluminium oxide?
2Al2O3 → 4Al + 3O2
answer is 76%, how do u get that

Original post by ricecakes1

What is the percentage yield when 20 g of aluminium are produced from 50 g of aluminium oxide?
2Al2O3 → 4Al + 3O2
answer is 76%, how do u get that

What are you thinking so far?

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What are you thinking so far?

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ok yes, i got the mass of Al, it'll be 26.5g. so if we do (20/26.5)x100 that equals 74.5%, how r they getting 76

Original post by ricecakes1

ok yes, i got the mass of Al, it'll be 26.5g. so if we do (20/26.5)x100 that equals 74.5%, how r they getting 76

74.5% is pretty close to 76% – what did you get for the molecular masses?

Spoiler

74.5% is pretty close to 76% – what did you get for the molecular masses?

Spoiler

sorry for responding late omg i got the answer now!! i just did some error when entering the values in the calc. tysm

Original post by ricecakes1

sorry for responding late omg i got the answer now!! i just did some error when entering the values in the calc. tysm

Fab, well done :smile:

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