a)2Al +3H2SO4--->Al2(SO4)3+3H2
b) n\(_{Al}=0,2\left(mol\right)\)
Theo pthh
n\(_{H2}=\frac{3}{2}n_{Al}=0,3\left(mol\right)\)
V\(_{H2}=0,3.22,4=6,72\left(l\right)\)
c) Theo pthh
n\(_{Al2\left(SO4\right)3}=\frac{1}{2}n_{Al}=0,1\left(mol\right)\)
m\(_{Al2\left(SO4\right)3}=0,1.342=34,2\left(g\right)\)
c) m\(_{H2}=0,6\left(g\right)\)
m\(_{dd}=200+25,4-0,6=244,8\left(g\right)\)
C%=\(\frac{34,2}{244,8}.100\%=13,97\%\)
Ta có : nAl = 0,2(mol)
a, PTHH: 2Al+3H2SO4--->Al2(SO4)3+3H2
=>nH2 = 0,3 (mol)
=>VH2 = 0,3 .22,4 = 6,72l
=>nAl2(SO4)3 = 0,1 (mol)
=>mAl2(SO4)3 = 0,1 . 342 = 34 , 2(g)
Ta có : mH2 = 0,6 (mol)
=>mdd =244,8 (g)
=>C% = 13,97%