a) PTHH: \(4Al+3O_2\rightarrow2Al_2O_3\)
b) _ Số ntử Al : số ptử O2 : số ptử Al2O3
= \(4:3:2\)
c) Theo ĐLBTKL có:
_ \(m_{Al}+m_{O_2}=m_{Al_2O_3}\)
\(\Rightarrow m_{Al_2O_3}=10,8+9,6=20,4\left(g\right)\).
a)\(4Al+3O_2\rightarrow2Al_2O_3\).
b)Al:\(O_2\)=4:3
Al:\(Al_2O_3\)=2:1
\(Al:Al_2O_3=\)3:2
c)\(m_{Al}+m_{O_2}=m_{Al_2O_3}\).
Hay 10,8+9,6=20,7g
Vậy \(m_{Al_2O_3}\)=20,7g