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A 6.977 g sample of a mixture was analys...

A `6.977` g sample of a mixture was analysed for barium ion by adding a small excess of sulphuric acid to an aqueous solution of the sample. The resultant reaction produced a precipitate of barium sulphate, which was collected by filtration, washed, dried and weighed. If `0.4123g` of barium sulphate was obtained, what was the mass percentage of barium in the sample?

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