$PTHH : \\CaCO_3\overset{t^o}\to CaO+CO_2 \\a.n_{CaCO_3}=\dfrac{11,2}{100}=0,112(mol) \\b.n_{CaO}=\dfrac{7}{56}=0,125mol \\Theo\ pt : \\n_{CaCO_3}=n_{CaO}=0,125mol \\⇒m_{CaCO_3}=0,125.100=12,5g \\c.n_{CaCO_3}=\dfrac{3,5}{100}=0,035mol \\Theo\ pt : \\n_{CO_2}=n_{CaCO_3}=0,035mol \\⇒V_{CO_2}=0,035.22,4=0,784l \\d.n_{CO_2}=\dfrac{13,44}{22,4}=0,6mol \\Theo\ pt : \\n_{CaCO_3}=n_{CaO}=n_{CO_2}=0,6mol \\⇒m_{CaCO_3}=0,6.100=60g \\m_{CaO}=0,6.56=33,6g$
