To find the mass of water removed from the crucible, we need to use the law of conservation of mass, which states that matter cannot be created or destroyed, only transformed from one form to another. In this case, we are dealing with a hydrate, which is a compound that contains water molecules that can be removed by heating.
To find the mass of water removed from the crucible, we need to subtract the mass of the anhydrous compound (the compound without water) from the mass of the hydrate before heating, and then subtract the mass of the anhydrous compound after heating from this value.
The mass of the anhydrous compound can be found by subtracting the mass of the hydrate from the mass of the crucible without the hydrate:
Anhydrous compound = 30.33 g - 28.33 g = 2 g
Next, we need to subtract the mass of the anhydrous compound after heating from the mass of the anhydrous compound before heating:
Mass of water removed = (29.54 g - 28.33 g) - 2 g = -0.79 g
The negative value indicates that the mass has decreased, which is expected since water has been removed. Therefore, the mass of water removed from the crucible is 0.79 g.