a: \(n_{O_2}=\dfrac{4.8}{32}=0.15\left(mol\right)\)
\(a,n_{O_2}=\dfrac{m_{O_2}}{M_{O_2}}=\dfrac{4,8}{32}=0,15\left(mol\right)\\ b,Số.phân.tử=n.6.10^{23}=0,15.6.10^{23}=9.10^{22}\left(p.tử\right)\)
c) Số nguyên tử Zn = Số phân tử O2
=> \(n_{Zn}=n_{O_2}=0,15\left(mol\right)\)
=> \(m_{Zn}=0,15.65=9,75\left(g\right)\)