Question: how many water molecules are formed after the formation of three triglycerides?
Answer: In the animation below, 3 molecules of fatty acid (stearic acid) combine with 1 molecule of glycerol, with the removal of 3 molecules of water (blue). Note that both glycerol and carboxylic acids have -OH bonds, which together contribute 2 hydrogen atoms and 1 oxygen atom to form the water.