To determine the missing coefficient for water based on the law of conservation of matter, we need to look at a specific chemical reaction. The law states that matter cannot be created or destroyed in a chemical reaction, meaning the number of atoms for each element must be the same on both sides of the equation.
If there's a specific reaction you have in mind that you would like to balance, please provide it, and I can help you find the missing coefficient for water in that reaction.
For example, in the combustion of glucose:
\[ C_6H_{12}O_6 + O_2 \rightarrow CO_2 + H_2O \]
Here, you would balance the reaction and determine the coefficients needed for water (H₂O).
If you provide the complete balanced equation, I can give you the correct coefficient for water based on that reaction.