1. Write the balanced chemical equation:

CH₄ + 2O₂ → CO₂ + 2H₂O

2. Identify the mole ratio:

The balanced equation shows that for every 1 mole of CH₄ reacted, 1 mole of CO₂ is produced.

3. Calculate moles of CO₂:

Since you have 2.0 moles of CH₄, and the mole ratio is 1:1, you will produce 2.0 moles of CO₂.