\(a) CaCO_3 + 2HCl \to CaCl_2 + CO_2 + H_2O\\ n_{CaCO_3} = n_{CO_2} = \dfrac{4,48}{22,4} = 0,2(mol)\\ m_{CaCO_3} = 0,2.100 = 20(gam)\\ b) n_{HCl} = 2n_{CO_2} = 0,4(mol)\\ \Rightarrow V_{dd\ HCl} = \dfrac{0,4}{3} = 0,13(lít)\)
CaCO3 + 2HCl → CaCl2 + CO2 + H2O
0.2 ← 0.4 ← 0.2
nCO2 = 4.48/22.4=0.2 mol
mCaCO3 = 0.2(40+12+16*3)=20g
vHCl = 0.4/3=\(\dfrac{2}{15}\)lít