\(2Mg+O_2\rightarrow\left(t^o\right)2MgO\)

0,2        0,1             0,2

\(n_{MgO}=\dfrac{8}{40}=0,2\left(mol\right)\)

\(m_{Mg}=0,2.24=4,8\left(g\right)\)

\(m_{O_2}=0,1.32=3,2\left(g\right)\)

\(n_{Mg}=\dfrac{4,1}{24}=\dfrac{41}{210}\left(mol\right)\)

PTHH :

\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)

41/210                 41/210      41/210

\(b,V_{H_2}=\dfrac{41}{240}.24,79=4,235\left(l\right)\)

\(c,m_{MgSO_4}=\dfrac{41}{240}.120=20,5\left(g\right)\)

\(n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\)

PTHH :

\(CaCO_3\overrightarrow{t^o}CaO+CO_2\)

0,1              0,1

\(m_{CaO\left(lt\right)}=0,1.56=5,6\left(g\right)\)

\(H=\dfrac{4,48}{5,6}.100\%=80\%\)

vâng ạ e lộn:(

\(n_{HCl}=0,2.0,5=0,1\left(mol\right)\)

PTHH :

\(CuO+2HCl\rightarrow CuCl_2+H_2O\)

0,05         0,1         0,05

\(b,m_{CuO}=0,05.80=4\left(g\right)\)

\(c,C_{M\left(CuCl_2\right)}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)

\(n_{MgO}=\dfrac{0,8}{40}=0,02\left(mol\right)\)

PTHH :

\(MgO+H_2SO_4\rightarrow MgSO_4+H_2O\)

0,02       0,02

\(a,m_{H_2SO_4}=0,02.98=1,96\left(g\right)\)

\(C\%=\dfrac{1,96}{50}.100\%=3,92\%\)