You're asking about the combustion of methane (CH4), which is a reaction with oxygen (O2) that produces carbon dioxide (CO2) and water (H2O). Here's how to figure out the moles of water produced:

1. Balanced Chemical Equation:

The balanced chemical equation for the combustion of methane is:

CH4 + 2O2 → CO2 + 2H2O

2. Mole Ratio:

This equation tells us that for every 1 mole of methane (CH4) that reacts, 2 moles of water (H2O) are produced.

3. Calculating Moles of Water:

To determine the exact number of moles of water produced, you would need to know the number of moles of methane that were combusted.

Example:

Let's say you start with 3 moles of methane (CH4). Using the mole ratio from the balanced equation:

* 3 moles CH4 * (2 moles H2O / 1 mole CH4) = 6 moles H2O

Conclusion:

Therefore, the complete combustion of methane will produce twice the number of moles of water as the moles of methane that were burned.