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GCSE chemistry exam question

Pls help guys. I do not get why the answer is 225
https://www.savemyexams.co.uk/uploads/5/0/8/7/50878855/high_demand-yield___atom_economy_chem_reactions_qp.pdf
Question 3iii
This is markscheme https://www.savemyexams.co.uk/uploads/5/0/8/7/50878855/high_demand-yield___atom_economy_chem_reactions_ms.pdf
I keep getting answer of 255 as I work out moles of hydrogen which is 90/2 which is 45. The ratio is 3:2 so moles of ammonia would be 30. So mass of ammonia is mr x moles which would be 30 x 17(mr of ammonia) which is 510 then half that cause it’s 50 percent. Pls help
moving to chemistry.
Your maths seems to check out. Since it’s not a very formal MS it’s possible that whoever made it made a mistake? I couldn’t find a different MS from like an exam board for the question

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