a) 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
b) \(n_{Al}=\dfrac{3,8}{27}=\dfrac{19}{135}\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
\(\dfrac{19}{135}\)-->\(\dfrac{19}{90}\)------------------->\(\dfrac{19}{90}\)
=> \(V_{H_2}=\dfrac{19}{90}.22,4=\dfrac{1064}{225}\left(l\right)\)
c) \(m_{H_2SO_4}=\dfrac{19}{90}.98=\dfrac{931}{45}\left(g\right)\)
=> \(m_{dd}=\dfrac{\dfrac{931}{45}.100}{15}=\dfrac{3724}{27}\left(g\right)\)