Sửa `CuO->CO` do CuO là rắn

`Z:CO:x(mol);CO_2:y(mol);H_2:z(mol)`

`->x+y+z={4,48}/{22,4}=0,2(1)`

`m_Z=28x+44y+2z=0,2.0,725.32=4,64(2)`

`2CO+O_2` $\xrightarrow{t^o}$ `2CO_2`

`2H_2+O_2` $\xrightarrow{t^o}$ `2H_2O`

`->n_{O_2}=0,5x+0,5z={1,456}/{22,4}=0,065(3)`

`(1)(2)(3)->x=0,05;y=0,07;z=0,08`

`\%V_{CO}={0,05}/{0,2}.100\%=25\%`

`\%V_{CO_2}={0,07}/{0,2}.100\%=35\%`

`\%V_{H_2}=100-35-25=40\%`