It will approximately take 2 hours and 50 minutes
I think quantitative observations involve numerical descriptions relating to an object while qualitative observations involve non-numerical descriptions of an object.
In this case the object is a hailstone so quantitative observations would be things such as its volume, mass, weight, temperature, and so on. Qualitative observations would be things like its color, texture, general shape, and so on.
I hope this helps. Let me know if anything is unclear.
Answer:
3 water molecules
Explanation:
The molar ratio between CuSO₄ and H₂O needs to be calculated.
The mass of water that was removed by heating is calculated, then converted to moles. The molecular weight of water is 18.02g/mol.
(8.97 g - 6.57 g) = 2.22 g H₂O
(2.22 g)/(18.02g/mol) = 0.1232 mol H₂O
The moles of anhydrous copper sulfate are calculated. The molecular weight is 159.609 g/mol
(6.57 g)/(159.609 g/mol) = 0.04116 mol CuSO₄
Now the molar ratio between CuSO₄ and H₂O can be calculated:
0.1232 mol H₂O ÷ 0.04116 mol CuSO₄ = 3 H₂O / CuSO₄
