Answer is: 0.5 dm³ to dissolve.
m(CuSO₄) = 11.2 g.
c(CuSO₄) = 0.140 mol/dm³,
V(CuSO₄) = ?
n(CuSO₄) = m(CuSO₄) ÷ M(CuSO₄).
n(CuSO₄) = 11.2 g ÷ 159.6 g/mol.
n(CuSO₄) = 0.07 mol.
V(CuSO₄) = n(CuSO₄) ÷ c(CuSO₄).
V(CuSO₄) = 0.07 mol ÷ 0.14 mol/dm³.
V(CuSO₄) = 0.5 dm³.
