Em tham khảo nha:
\(\begin{array}{l}
a)\\
{n_{Al}} = \dfrac{{0,29}}{{27}} = 0,011\,mol\\
b)\\
{n_{NaCl}} = \dfrac{{11,7}}{{58,5}} = 0,2\,mol\\
c)\\
{n_{CuS{O_4}.5{H_2}O}} = \dfrac{{12,5}}{{250}} = 0,05\,mol\\
d)\\
{n_{{O_2}}} = \dfrac{{1,12}}{{22,4}} = 0,05\,mol\\
e)\\
{n_{{H_2}S{O_4}}} = 0,2 \times 0,6 = 0,12\,mol\\
f)\\
{n_{hh}} = \dfrac{{3,36}}{{22,4}} = 0,15\,mol\\
g)\\
{n_{HCl}} = 0,3 \times 0,3 = 0,09\,mol\\
{n_{{H_2}S{O_4}}} = 0,3 \times 0,9 = 0,27\,mol\\
h)\\
{n_{MgC{l_2}}} = \dfrac{{200 \times 19\% }}{{95}} = 0,4\,mol
\end{array}\)