\(n_{CaO}=\dfrac{403,2}{56}=7,2\left(kmol\right)\)
\(m_{CaCO_3}=1000.\left(100-10\right)\%=900\left(kg\right)\Rightarrow n_{CaCO_3}=\dfrac{900}{100}=9\left(kmol\right)\)
PTHH: \(CaCO_3\xrightarrow[]{t^o}CaO+CO_2\)
7,2<------7,2
\(\Rightarrow H=\dfrac{7,2}{9}.100\%=80\%\)