When 5.00 g of fecl3 . xh2o are heated, 2.00 g of h20 are driven off. find the chemical formula and the name of the hydrate

The chemical formula is FeCL3* 6H2O

The  name of this hydrate is Iron(III) Chloride Hexahydrate  or Ferric Chloride Hexahydrate

Explanation:

Step 1: Data given

Mass of FeCl3 * xH2O = 5 grams

mass of H2O = 2 grams

Molar mass of FeCl3 = 162.2 g/mol

Molar mass of H2O = 18.02 g/mol

Step 2: Calculate mass of FeCl3

After heating, the remaining mass, is the mass of FeCl3, because H2O (2 grams) is driven off.

Mass FeCl3 = 5-2 = 3grams

Step 3: Calculate number of moles

Number of moles = mass / molar mass

Moles of FeCl3 = 3.00 grams / 162.2 g/mol = 0.0185 moles

Moles of H2O = 2.00 grams / 18.02 g/mol = 0.111 moles

Step 4: Divide the number of moles by the smallest number of moles

The smallest number is 0.0185; so we will divide both by 0.0185

FeCl3 = 0.0185 /0.0185 = 1

H2O = 0.111 / 0.0185 ≈ 6

This means for 1 mole of FeCl3 we have 6 moles of H2O

The chemical formula is FeCL3* 6H2O

The  name of this hydrate is Iron(III) Chloride Hexahydrate  or Ferric Chloride Hexahydrate

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".