Em tham khảo nha:
\(\begin{array}{l}
a)\\
{m_{CaO}} = n \times M = 0,75 \times 56 = 42g\\
b)\\
{m_{Fe}} + {m_{Cu}} = 0,3 \times 56 + 0,2 \times 80 = 32,8g\\
c)\\
{n_{S{O_2}}} = \dfrac{{4,48}}{{22,4}} = 0,2\,mol\\
{m_{S{O_2}}} = 0,2 \times 64 = 12,8g\\
d)\\
{n_{CO}} = \dfrac{{11,2}}{{22,4}} = 0,5\,mol\\
{n_{C{O_2}}} = \dfrac{{5,6}}{{22,4}} = 0,25\,mol\\
m = 0,25 \times 44 + 0,5 \times 28 = 25g
\end{array}\)