mCuSO4(100*C) = a
=> \(S\left(100\cdot C\right)=\frac{a}{650-a}.100=87\left(g\right)\)
=> a = 302,41(g)
mCuSO4(15*C) = b
=> \(S\left(15\cdot C\right)=\frac{b}{650-b}.100=24\left(g\right)\)
=> b = 125,81 (g)
=> mCuSO4 (tách ra) = 302,41 - 125,81=176,6 (g)