Why is my answer incorrect? (1 Viewer)

[An0nyM0usUseR455]

Here is the question:


and here is my working

 

[An0nyM0usUseR455]

btw the answer is half of what i got

 

[user18181818]

Where is this from? I am getting the same answer as u

 

[SB257426]

Where is this from? I am getting the same answer as u

his question is from the chem in focus textbook... im getting the same answer as both of u

 

[Luukas.2]

7.5 % is correct