2Mg+O2-to>2MgO
n O2=\(\dfrac{4,48}{22,4}\)=0,2 mol
=>m O2=0,2.32=6,4g
BTKL :
m MgO=6,4+4,8=11,2g
\(n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ m_{O_2}=0,2.32=6,4\left(g\right)\)
PTHH : Mg + O2 -> 2MgO
Theo ĐLBTKL
\(m_{Mg}+m_{O_2}=m_{MgO}\\ =>m_{MgO}=4,8+6,4=11,2\left(g\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
\(n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: 2Mg + O2 --to--> 2MgO
Xét tỉ lệ: \(\dfrac{0,2}{2}< \dfrac{0,2}{1}\) => Mg hết, O2 dư
PTHH: 2Mg + O2 --to--> 2MgO
0,2---------------->0,2
=> mMgO = 0,2.40 = 8(g)