Calculate the mass percent of oxygen in chromium(III) nitrate, round your answer to the nearest percent

 

This is the chemical formula for chromium(iii) carbonate: Cr₂(CO₃)₃. Calculate the mass percent of carbon in chromium(iii) carbonate. Round your answer to the nearest percentage.

Chromium is obtained by heating chromium(III) oxide with carbon. Calculate the mass percent of chromium in the oxide, and then use this value to calculate the quantity of Cr₂O₃ required to produce 850 kg of chromium metal.