\(m_{CaCO_3}=1000\cdot92\%=920\left(g\right)\\ \Rightarrow n_{CaCO_3}=\dfrac{920}{100}=9,2\left(mol\right)\\ PTHH:CaCO_3\rightarrow^{t^0}Cao+CO_2\\ \Rightarrow n_{CaO}=9,2\left(mol\right)\\ \Rightarrow m_{CaO}=9,2\cdot56=515,2\left(g\right)\\ \Rightarrow m_{CaO.thực.tế}=515,2\cdot95\%=489,44\left(g\right)\)