Question

part b
when carbon is burned in air, it reacts with oxygen to form carbon dioxide. when 26.4 g of carbon were burned in the presence of 82.4 g of oxygen, 12.0 g of oxygen remained unreacted. what mass of carbon dioxide was produced?
express your answer to one decimal place and include the appropriate units.
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Explanation:

Step1: Calculate mass of oxygen reacted

The initial mass of oxygen is 82.4 g and 12.0 g remained unreacted. So the mass of oxygen that reacted is $m_{O_{2}\ reacted}=82.4 - 12.0=70.4$ g.

Step2: Use law of conservation of mass

According to the law of conservation of mass, in a chemical reaction, the total mass of reactants is equal to the total mass of products. The reactants are carbon and oxygen, and the product is carbon - dioxide. The mass of carbon is 26.4 g and the mass of oxygen that reacted is 70.4 g. So the mass of carbon dioxide produced is $m_{CO_{2}}=26.4 + 70.4 = 96.8$ g.

Answer:

96.8 g