When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 25.2 of carbon were burned in the presence of 80.6 of oxygen, 13.4 of oxygen remained unreacted. What mass of carbon dioxide was produced?
No units again on any of the numbers.
Subtract oxygen initially - oxygen at the end. That turns it into a stoichiometry problem. Use the link from the last post.
To find the mass of carbon dioxide produced, we need to determine the amount of oxygen that reacted with carbon and the amount of oxygen that remained unreacted.
First, we need to determine the amount of oxygen that reacted with carbon. We can do this by subtracting the amount of oxygen that remained unreacted from the initial amount of oxygen:
Amount of oxygen reacted = Initial amount of oxygen - Amount of oxygen remained unreacted
Amount of oxygen reacted = 80.6 g - 13.4 g
Amount of oxygen reacted = 67.2 g
Since the reaction between carbon and oxygen is in a 1:1 ratio, the amount of carbon dioxide produced will also be 67.2 g.
Thus, the mass of carbon dioxide produced is 67.2 grams.