Answer :
The mass percentage of carbon in the carbon dioxide is 27.0%.
One barrel of crude oil produces 322 kg of carbon dioxide, which is composed of carbon and oxygen. From the balanced chemical equation for the combustion of hydrocarbons, we know that one mole of carbon produces one mole of carbon dioxide. The molar mass of carbon is 12.01 g/mol, and the molar mass of carbon dioxide is 44.01 g/mol. Therefore, the mass percentage of carbon in carbon dioxide is:
- (12.01 g C / 44.01 g CO₂) x 100% = 27.0%
This means that for every 100 g of carbon dioxide produced from the combustion of crude oil, 27 g of it is carbon. Since crude oil contains 84% carbon by mass, this suggests that the carbon in the crude oil is not being fully converted to carbon dioxide during combustion, and that other carbon-containing compounds are being produced as well.
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