Calculate the volume of carbon dioxide released during thermal decomposition of 96 g of limestone containing 9% impurities.

Given:
m mixture (CaCO3) = 96 g
w approx (CaCO3) = 9%
To find:
V (CO2)
Decision:
CaCO3 = CaO + CO2
w is clean. islands (CaCO3) = 100% -9% = 91% = 0.91
m in islands (CaCO3) = m mixture * w pure. in-va = 96 g * 0.91 = 87.36 g
n (CaCO3) = m / M = 87.36 g / 100 g / mol = 0.87 mol
n (CaCO3): n (CO2) = 1: 1
n (CO2) = 0.87 mol
V (CO2) = n * Vm = 0.87 mol * 22.4 l / mol = 19.49 l
Answer: 19.49 L