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Opinions on OCR Chemistry Unified paper? 27/06/17

Found every question easy as pie, but not enough time to finish. In comparison to the other papers this was the hardest and made me think. Also, is it me or was the 200 micro gram question stupid, and just a simple conversion from 200 micro-grams to grams, giving an answer of 0.0002g?
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AMS88
Original post by Invective
Found every question easy as pie, but not enough time to finish. In comparison to the other papers this was the hardest and made me think. Also, is it me or was the 200 micro gram question stupid, and just a simple conversion from 200 micro-grams to grams, giving an answer of 0.0002g?

That was just the mass of Cr in the complex. You had work out what fraction of the mass that it was (52/418).
Then multiply 200 micro grams by the inverse of the fraction (418/52)
To get 1.61x10^-3 g

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