2Al + 2H2SO4 → Al2(SO4)3 + 3H2
\(n_{H_2}\)= \(\dfrac{V}{22.4}\)= \(\dfrac{6.72}{22.4}\)= 0.3 (mol)
theo phương trình :
\(n_{Al}\)=\(\dfrac{2}{3}\) x \(n_{H_2}\)= 0.2 ( mol)
\(m_{Al}\)= n x M = 0.2 x 27 = 5.4 (g)
2 Al+ 3H2SO4 =Al2(SO4)3 + 3H2 (1)
nH2= 6,72:22,4= 0,3 (mol)
Theo (1) nAl = 2/3 nH2 =0,2 (mol)
a) mAl = 0,2*27= 5,4 (g)
b) Theo (1) nAl2(SO4)3 = 1/3 nH2 = 0.1 (mol)
mAl2(SO4)3 = 0.1*(27*2+32*3+16*12)=34.2(g)
c)Theo (1) nH2 =nH2SO4=0,3( mol)
mH2SO4 = 0.3*(2+32+16*4)=29,4(g)