Ethane fuel, $\text{C}_2\text{H}_6$, reacts with oxygen in air to produce carbon dioxide and water. $2\text{C}_2\text{H}_6 + 7\text{O}_2 \rightarrow 4\text{CO}_2 + 6\text{H}_2\text{O}$ Which of the following statements about the combustion of ethane is correct?
- AWhen one molecule of ethane burns, one molecule of water is formed.
- BThe number of atoms at the end of the reaction is the same as at the start.
- CDuring the reaction there is a decrease in the number of molecules.
- DThe reaction is endothermic.