Question

The solubility of copper(II) sulfate crystals (CuSO4·5H2O) is 38.0 g per 100 g of water at 20 °C. 100 g of the crystals are mixed with 200 g of water at 20 °C.
What mass of copper(II) sulfate crystals will remain undissolved?
A 24.0 g
B 62.0 g
C 19.0 g
D 76.0 g
E 124 g

Answer 1

Answer:

A. 24 g

solubility in 100 g of water is 38 g then solubility in 200 g of water is 76 g

76 g will dissolve and rest will remain undissolved.

So,

100 - 76 = 24 g