Help with Chem problem pls

Question

Given the reaction of methane and Oxygen Gas, how many moles of water is produced if

you start with 10 moles of methane?

CH₄ (g) + 2 o₂(g) -› CO₂ (g) + 2 H20 (g)

Answer 1

CH₄ (g) + 2 O₂(g) ==> CO₂ (g) + 2 H₂0 (g) ... balanced equation

Assuming O₂ is present in excess, then ...

10 mols CH₄ x 2 mols H₂O / 1 mol CH₄ = 20 mols H₂O is produced