You have to write a ratio, of what you have, and what your procedure requires, and multiply it by what you weigh, to determine the potency of what you prepare. I hope that's clear enough for you to follow, because we do like to help people to do things for themselves on this forum. However, you're question is not very clear, I don't really know, what you have, and I really don't know what you need.
Another way of looking at the problem is to consider anions, and water of crystallization as impurities, that drive your mass down. You seem to be saying that there will be more in the vial, when it's given that it's the acetate, and that's not correct. The water of crystallization, I don't know where that enters into what you have.