Answer to Question #137434 in General Chemistry for Shane Estera

Question

IF ONLY FERRIC CHLORIDE IS AVAILABLE IN THE MARKET INSTEAD OF FERRIC SULFATE, CALCULATE THE OPTIMAL MASS YOU WOULD NEED TO PURCHASE EVERY DAY

Answer 1

Molicular formula of FERRIC CHLORIDE is = FeCl₃

Molicular weight of FeCl₃

(Atomic mass of Fe + atomic mass of chlorine ×3)

= (56+ 35.5×2)

= 56+ 71

= 127 g/mol

Molicular formula of FERRIC SULFATE is = Fe₂(SO4)₃

Molicular weight of Fe₂(SO4)₃

(Atomic mass of Fe + atomic mass of chlorine ×3)

= 56×2+(32×3+12×16

= 400 g/mol

Hence,

If only FERRIC CHLORIDE is available in the market instead of FERRIC SULFATE, I need to purchase 127g FERRIC CHLORIDE for every 400 g of FERRIC SULFATE.