Coi hh X là kim loại R có hóa trị n
`=>` \(n_R=\dfrac{7,8}{M_R}\left(mol\right)\)
PTHH: \(2R+nCl_2\xrightarrow[]{t^o}2RCl_n\)
\(\dfrac{7,8}{M_R}\rightarrow\dfrac{3,9n}{M_R}\)
`=>` \(n_{Cl_2}=\dfrac{3,9n}{M_R}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
- Mặt khác: \(n_R=\dfrac{11,7}{M_R}\left(mol\right)\)
PTHH: \(2R+nH_2SO_4\rightarrow R_2\left(SO_4\right)_n+nH_2\)
\(\dfrac{11,7}{M_R}\)-------------------------------->\(\dfrac{5,85n}{M_R}\)
`=>` \(n_{H_2}=\dfrac{5,85}{M_R}=1,5.\dfrac{3,9}{M_R}=1,5.0,5=0,75\left(mol\right)\)
`=> V = 0,75.22,4 = 16,8 (l)`