Calculate the masses of copper sulfate (ll) and water, which must be taken to prepare a solution

Calculate the masses of copper sulfate (ll) and water, which must be taken to prepare a solution of 100 g, with a mass fraction of dissolved substance of 0.04.

Given:
w (CuSO4) = 0.04
m (solution) = 100g
m (CuSO4) -?
m (H2O) -?

Solution:
m (CuSO4) = w * m (solution) = 4g
m (H2O) = m (solution) -m (CuSO4) = 96g
Answer: 96g



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