Question

You will need to prepare about 6 g of the copper ammine product. estimate how much cuso4•5h2o you should start with to prepare approximately 6 g of the copper ammine complex.

Answer 1

First we have to write balanced chemical equation:
CuSO₄.5H₂O + 4 NH₃ → [Cu(NH₃)₄]SO₄.H₂O + 4 H₂O
then calculate the molar mass of both CuSO₄.5H₂O and [Cu(NH₃)₄]SO₄.H₂O
MM CuSO₄.5H₂O = 249.612 g/mole
MM [Cu(NH₃)₄]SO₄.H₂O = 245.612 g/mole
from equation we see that:
1 mole CuSO₄.5H₂O   ---gives ---> 1 mole [Cu(NH₃)₄]SO₄.H₂O
          249.612 g          ---gives --->         245.612 g 
            ? grams           ---gives --->            6 g complex
By cross multiplication we get that:
mass of CuSO₄.5H₂O required = 6.1 g