How do you calculate how many millimoles of 1.5g of salicylic acid are present in a reaction?

a student adds 1.5 grams of salicylic acid into a flask and then added 4mL of acetic an hydride to react. He also added 5 drops of concentrated sulfuric acid. Density of acetic an hydride is 1.08g/ml and density of sulfuric acid is 1.85g/ml Calculate how many milli moles of salicylic acid, acetic an hydride, and sulfuric acid were present in the reaction vessel