n H2SO4= m/M= 19.6/98=0.2
Pt: 2Al + 3H2SO4= Al2(SO4)3 + 3H2
2/15------ 0,2----------------------0,2
a> mAl= n.M= 2/15.27=3.6g
b> VH2= n.22,4=0,2.22,4=4,48(l)
(n_{H_2SO_4}=dfrac{19,6}{98}=0,2left(mol ight))
2Al + 3H2SO4 ( ightarrow) Al2(SO4)3 + 3H2
de: (dfrac{2}{15}) (leftarrow) 0,2 ( ightarrow) 0,3
a, (m_{Al}=dfrac{2}{15}.27=3,6g)
b, (V_{H_2}=22,4.0,3=6,72l)