[Rachael]

C2H5OH(g) + 3O2(g) ==> 2CO2(g) + 3H2O(g)

you have to figure out the water vapor
so i tried to convert it to volume but you don't know the volume...

3 mol H2O/L so then I got 3 liters

then I thought lets try going from moles to mass to liters and did this...

3 mol H2O (18.02/1 mol) = 54.06 then convert to volume equals 54.06... which was the wrong answer... *delete me*!!

[Yggdrasil]

Since water vapor is a gas, try treating water vapor as an ideal gas and figuring out the volume that way.