* Air Composition: Air is a mixture of gases, primarily nitrogen (78%), oxygen (21%), and a small percentage of other gases like argon, carbon dioxide, and others.
* Combustion: Burning (combustion) is a chemical reaction that requires a fuel and an oxidizer. Oxygen is the most common oxidizer.
* Unknown Fuel: You haven't specified what substance is burning. Different fuels have different reactions with oxygen and consume different amounts of oxygen.
To answer your question, you would need to know:
1. The substance burning: What is the fuel?
2. The chemical reaction: How does the fuel react with oxygen?
3. The stoichiometry: What are the proportions of fuel and oxygen in the reaction?
Example:
Let's say the substance burning is pure methane (CH4). The reaction with oxygen is:
CH4 + 2O2 → CO2 + 2H2O
This means 1 molecule of methane reacts with 2 molecules of oxygen.
However, even with this information, you still can't calculate the remaining gas volume without knowing the initial volume of each gas in the 200 cm³ of air.
In short: The amount of gas remaining after burning 200 cm³ of air depends heavily on what is burning and the specific chemical reaction.
