posted by Rene' .
At 20 degrees celsius ,if the equation is C7H6O3(s)+C4H6O3(l)=C9H8O4+HC2H3O2(l), then how many liters of acetic acid, HC2H3O2 , would be formed if the density of HC2H3O2 is 1.05 g/ml?
You don't have enough information in the post to answer the question. I assume this is an aspirin problem and you're starting with acetic anhydride and salicylic acid and you want to know how much acetic acid is produced then calculate the volume from the mass. Assuming you have all of the data, then
mass acetic acid = volume x density.
You have mass and density; calculate volume.