combustion reaction

[506031050]

When looking at a combustion reaction and calculating moles, do we only look at the moles from gas or do we look at solids and liquids as well?

[Paparvinee 1I]

I'm not sure if this is what you mean, but if you want to calculate the change in volume using PV=nRT, then n is equal to the change in moles of gas only.

[606228744]

Typically, you would only look at moles of gas when doing calculations unless for example it gives you the mass of a solid to start off a calculation with if that makes sense.