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Help with IGCSE Chemistry paper 3 exam question

W

WW66F1980

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I've come across a question on the May/June 2009 IGCSE Chemistry Paper 3 past paper exam.

It's question 7(b) (first variant) of this paper: http://www.xtremepapers.me/CIE/Cambridg ... 9_qp_3.pdf

I've checked the mark scheme and all is says is T3(PO4)2 but I've no idea why that's the answer. I know it's something to do with mole ratio but really can't work it out!

Please help someone.
 
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