1)
\(M_A=14.2=28\left(\dfrac{g}{mol}\right)\\ n_A=\dfrac{2,8}{28}=0,1\left(mol\right)\\ V_{A\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\)
2)
\(Số.nguyên.tử.C:\dfrac{11,2}{22,4}.6.10^{23}=3.10^{23}\left(nguyên.tử\right)\\ Số.nguyên.tử.O:\dfrac{11,2}{22,4}.2.6.10^{23}=6.10^{23}\left(nguyên.tử\right)\)