Water in combustion

[Jeffrey Hablewitz 2I]

Is the water that is produced in combustion generally in the liquid or gaseous phase? Does the Δn of gaseous molecules in a combustion reaction = (mol H₂O + CO₂) - (moles of gaseous reactants)?

[Nane Onanyan 1G]

Water vapor is released in a combustion reaction so it should be written as H2O(g). The vapor can condense to liquid water after, but it is not because of the reaction itself and therefore we don't really focus on liquid water.
And you are correct about the change in moles!

[Shawn Suen]

Yes, the water in the products of a combustion reaction are in the form of a gas. Part of the reason for this is because combustion reactions are generally exothermic and release heat during the reaction.

[Kassandra Javier 2D]

You can confirm that the H2O released is in the gaseous form because when we exhale (since respiration and metabolism in our bodies also deals with combustion), our breath fogs up glass. That means we are breathing out gases including water vapor.