[narutodemonkill]

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

[sjb]

How many moles are there in 71g of FeCO₃.H₂O ?

[narutodemonkill]

How many moles are there in 71g of FeCO₃.H₂O ?

So m/molar mass gives you mols 71g/133.88( molar mass of entire hydrat
0.5303 mols.


0.5303 mols * 1 mol of FeCo₃/1 mol FeCO₃.H₂O

0.5303 FeCO₃ * (115.86g/mol--> molar mass of FeCO3)= 61.441 grams of anyhydrous remains?

[Schrödinger]

Yes. That's right.