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There is $0.008$ moles of $\ce{PO4^{3-}}$ ions. So the total number of negative charges is $3·0.008 = 0.024$ moles. This number must be equal to the number of positive charges. Let's check it. As there is also $0.012$ mol $\ce{T^{x+}}$, the total number of positive charges is : $\pu{x · 0.012 = 0.024}$ moles. As a consequence x = $2$, and the unknown ion $\... 11 According to Lamb, A. E., Anderson, C. W. N. & Haverkamp, R. G. (2001). The induced accumulation of gold in the plants Brassica juncea, Berkheya coddii and chicory. Chem New Zealand. 2011, 34-36., the leaves, stems, and roots of the mustard plant contain$\approx \pu{100 mg}\$ of gold per kg of dried biomass in certain soils. So if a fresh mustard plant ...