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Cm = 0,2 mol/dm³
M CaCO₃ = 100 g/mol
m CaCO₃ = 40% * 10 g = 4 g
2 mole HCl ---- 100 g CaCO₃
x ---- 4 g CaCO₃
x = 0,08 mola
Cm = n/V
V = Cm/n
V = 0,2 mol/dm³ / 0,08 mol = 0,4 dm³ = 400 cm³