a. PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 0,2mol:0,3mol\leftarrow0,1mol:0,3mol\)
b. \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
\(m_{Al}=0,2.27=5,4\left(g\right)\)
c. \(m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2\left(g\right)\)
nH2=6,72:22,4=0,3 (mol)
PT : 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
0.2 <-- 0,1 <-- 0,3
mAl= 0,2 * 27 =5,4 (g)
m Al2(SO4)3=0,1 * 342 = 34,2 (g)
a) 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
b) \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
Theo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=\dfrac{2}{3}\times0,3=0,2\left(mol\right)\)
\(\Rightarrow m=m_{Al}=0,2\times27=5,4\left(g\right)\)
c) Theo PT: \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2}=\dfrac{1}{3}\times0,3=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=0,1\times342=34,2\left(g\right)\)
a. PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
Ta có: \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
b. Theo PT ta có: \(n_{Al}=\dfrac{0,3.2}{3}=0,2\left(mol\right)\)
\(\Rightarrow m_{Al}=0,2.27=5,4\left(g\right)\)
c. Theo PT ta có: \(n_{Al_2\left(SO_4\right)_3}=\dfrac{0,3.1}{3}=0,1\left(mol\right)\)
\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2\left(g\right)\)
a, Ta có phương trình: 2Al + 3H2SO4-----> Al2(SO4)3 + 3H2
Mol phương trình: 2 : 3 : 1 : 3
Mol đề bài : 0,2 0,3
b, Ta có: nH2 = V/22,4 = 6,72/22,4 = 0,3(mol)
=>nAl = 0,3*2/3 = 0,2(mol)
=>mAl = 0,2*27 =5,4(g)
c, Ta có: nAl2(SO4)3 = 0,3*1/3 = 0,1(mol)
=>mAl2(SO4)3 = 0,1*342 = 34,2(g).
nH2=6,72:22,4=0,3 (mol)
PT : 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
0.2 <-- 0,1 <-- 0,3
mAl= 0,2 * 27 =5,4 (g)
m Al2(SO4)3=0,1 * 342 = 34,2 (g)