So if I had 0.1504g of product and that took around 21cm3 to titrate.
So number of moles = 0.01979 x 21cm3 = 0.0004moles
That would mean a molar mass = 0.1504/0.0004 = 361.895.
So if the Mr of my product is 411.3348. I then subtract them to get 50. then if i divide this by the mr of water, which is roughly 18, i get 2.78, which is closer to 3 i guess, so the number for X, is 3?