One of the hydrates of FeCO3 is iron(II) carbonate monohydrate. A 71.0 gram sample of FeCO3H2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?
I know if you know the mass of hydrate and mass of water than to find the amoutn of water molecule is substance you do mols of water/ mols of anhydrous.
but how would you do this question