The following diagram represents the reaction of methane with oxygen gas to form carbon dioxide and water.
The chemical reaction shown above takes place in a closed system. What is true about the system while the reaction occurs?
![The following diagram represents the reaction of methane with oxygen gas to form carbon dioxide and water The chemical reaction shown above takes place in a clo class=](https://us-static.z-dn.net/files/dd3/d70d060a7e72f3b35310857a5c20a8f1.png)