A mixture containing only aluminum tetrafl uoroborate, Al(BF₄)₃ (FM 287.39), and magnesium nitrate, Mg(NO₃)₂ (FM 148.31), weighed 0.282 8 g. It was dissolved in 1 wt% HF(aq) and treated with nitron solution to precipitate a mixture of nitron tetrafluoroborate and nitron nitrate weighing 1.322 g. Find the wt% Mg in the original solid mixture.

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H NC,Hs NC,H5 BF, CH5 C,Hs CH5 CH; Nitron Nitron tetrafluoroborate C20H16N4 FM 312.37 C2,H1,N,BF, FM 400.18 H NC,H5 Nitron nitrate NO, C20H17N,O3 FM 375.39 N CH, C,H,