\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
100ml = 0,1l
\(n_{H2SO4}=0,5.0,1=0,05\left(mol\right)\)
Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2|\)
2 3 1 3
0,2 0,05 \(\dfrac{1}{60}\) 0,05
a) Lập tỉ số so sánh : \(\dfrac{0,2}{2}>\dfrac{0,05}{3}\)
⇒ Al dư , H2SO4 phản ứng hết
⇒ Tính toán dựa vào số mol của H2SO4
\(n_{H2}=\dfrac{0,05.3}{3}=0,05\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,05.22,4=1,12\left(l\right)\)
b) \(n_{Al2\left(SO4\right)3}=\dfrac{0,05.1}{3}=\dfrac{1}{60}\left(mol\right)\)
\(C_{M_{Al2\left(SO4\right)3}}=\dfrac{1}{\dfrac{60}{0,1}}=0,17\left(M\right)\)
Chúc bạn học tốt
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{H_2SO_4}=0,1.0,5=0,05\left(mol\right)\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ Vì:\dfrac{0,05}{3}< \dfrac{0,2}{2}\Rightarrow Aldư\\ n_{H_2}=n_{H_2SO_4}=0,05\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\\ b,V_{ddsau}=V_{ddH_2SO_4}=0,1\left(l\right)\\ n_{Al_2\left(SO_4\right)_3}=\dfrac{0,05}{3}=\dfrac{1}{60}\left(mol\right)\\ C_{MddAl_2\left(SO_4\right)_3}=\dfrac{\dfrac{1}{60}}{0,1}=\dfrac{1}{6}\left(M\right)\)
