nAl =\(\dfrac{5.4}{27}\)=0.2 (mol) đổi 200ml = 0,2l
nH2SO4 = Cm.V =1,35.0,2=0,27(MOL)
2Al + 3H2SO4\(\overrightarrow{ }\)Al2(SO4)3 + 3H2
pt; 2 ; 3 : 1 : 3
đb; 0.18 : 0.27 : 0.09 : 0.27 (mol)
so sánh nAl =\(\dfrac{0.2}{2}\)>nH2SO4 =\(\dfrac{0.27}{3}\)
a, nAl dư = 0.2-0.18=0.02(mol)
m Al dư = 0,02.27=0.54(g)
b, V\(H\)\(2\)=0,27.22,4 = 6,048(l)
c, dd tạo thành sau pư là Al2(SO4)3
Cm Al2(SO4)3 = \(\dfrac{n}{V}\)=\(\dfrac{0.09}{0.2}\)=0.45M
THE END
$n_{H_2SO_4}=1,35.0,4=0,54mol$
$n_{Al}=10/27≈0,37mol$
$a.$ $2Al + 3H_2SO_4\to Al_2(SO_4)_3+3H_2↑$
b.Theo pt : 2 mol 3 mol
Theo đbài : 0,37 mol 0,54 mol
Tỷ lệ : $\dfrac{0,37}{2}>\dfrac{0,54}{3}$
⇒Sau pư Al dư
Theo pt :
$n_{Al\ pư}=2/3.n_{H_2SO_4}=2/3.0,54=0,36mol$
$⇒n_{Al\ dư}=0,37-0,36=0,01mol$
$⇒m_{Al\ dư}=0,01.27=0,27g$
c.Theo pt :
$n_{H_2}=n_{H_2SO_4}=0,54mol$
$⇒V_{H_2}=0,54.22,4=12,096l$
d.Theo pt :
$n_{Al_2(SO_4)_3}=1/3.n_{H_2SO_4}=1/3.0,54=0,18mol$
$⇒C_{M_{Al_2(SO_4)_3}}=\dfrac{0,18}{0,4}=0,45M$
