Hello this is my question. Ok I need to find the molar mass of acetic acid and then calculate the mass of acid in the volume of vinegar I used. Now the equation for the lab i did was CH3COOH + NaOH produces NaCH3COO + H20 The information I have is that the concentration of the sodium hydroxide is 0.20 mol/L, the volume of sodium hydroxide is 79mL, the volume of acetic acid I used was 25mL, I calculated the number of moles use in the sodium hydroxide and it was 0.0158 mol and since everything is on a 1 to 1 basis the number of moles for the acetic acid is 0.0158mol. From that I calculated the number of moles of acetic acid and it is 0.632 mol/L. I calculated the molar mass of the acetic acid by taking the 0.0158 mol of CH3COOH x 60g (the weight of the acid) which got me an answer of 0.948 grams. Now what I do not understand is how to calculate the mass of acid in the volume of vinegar. I may have everything to answer the question here but i just dont know what to do. Plz Help me!