A 1.245 gram sample of a compound containing barium and, Ask an Expert

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A 1.245 gram sample of a compound containing barium and oxygen was dissolved in hydrochloric acid to give a solution of barium ion, which was then completely precipitated out with an excess potassium chromate to give 2.012 grams of barium chromate, BaCrO4

a) how many moles of barium ions were in the original sample

b) how many grams of barium ions were in the original sample

c) how many grams of oxygen ions were in the original sampe

d) what is the percentage by mass of O ions in the original(1.345g) sample

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