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100g 22,4dm³
CaCO₃ + 2HCl --> CaCl₂ + H₂O + CO₂
45g x
x = 10,08dm³
M CaCO3 = 40u + 3*16+ 12 = 100u
M CO2 = 44u
m CaCO3 = 45g
100g CaCO3 ------------------44g CO2
45gCaCO3 ------------------------ x
x=19.8 g CO2