In theory no difference- both are CaCl2. However in practise fused is sold with a higher moisture content (usually). Fused CaCl2 is just the hydrate heated up to expel water - this gives the "anhydrous" form. in practise as this so deliquiscent- it takes up moisture readily. So if you analyse it you invariably find water!
CaCl2
Calcium chloride is a water absorbant.
It's cheap and it works.
Anhydrous calcium chloride
Anhydrous calcium chloride (CaCl2) is extremely hygroscopic, meaning it readily adsorbs water or moisture from the surroundings. Therefore, calcium chloride is commonly used as a dessicant.
Calcium chloride easily absorb water, it is hygroscopic.
The difference of calcium chloride and fused calcium chloride is the bond acting on their molecules. The fused calcium chloride is fused while the calcium chloride is not fused.
CaCl2
Calcium chloride is a water absorbant.
The nail would not go rusty because it was kept dry and the anhydrous calcium chloride removed the moisture from the air
Calcium chloride has the formula CaCl2 if anhydrous. Potassium phosphate has the formula K3PO4.
2NH4Cl + CaO --> 2NH3 + CaCl2 + H2O
Anhydrous calcium chloride
It's cheap and it works.
Anhydrous calcium chloride (CaCl2) is extremely hygroscopic, meaning it readily adsorbs water or moisture from the surroundings. Therefore, calcium chloride is commonly used as a dessicant.
To dry hydrogen gas.
the adsorption capacity of calcium is 0.78 kg/ kg of calcium chloride from one article on adsorption cycle