a)
$CaCO_3 \xrightarrow{t^o} CaO + CO_2$
$n_{CaO} = n_{CaCO_3} = \dfrac{150}{100} = 1,5(kmol)$
$m_{CaO} = 1,5.56 = 84(kg)$
b)
$n_{CaO} = n_{CaCO_3\ pư} = 1,5.80\% = 1,2(kmol)$
$m_{CaO} = 1,2.56 = 67,2(kg)$
\(a.PTHH:CaCO_3\underrightarrow{to}CaO+CO_2\\ n_{CaO}=n_{CaCO_3}\\ \rightarrow m_{CaO}=\dfrac{56}{100}.150=84\left(kg\right)\\ b.m_{CaO}=84.80\%=67,2\left(kg\right)\)