a) \(n_{H_2SO_4}=\dfrac{58,8}{98}=0,6\left(mol\right)\)
\(PTHH\): \(2Al+3H_2SO_4->Al_2\left(SO_4\right)_3+3H_2\)
______0,4<------0,6------------------------->0,6
=> VH2 = 0,6.22,4 = 13,44 (l)
b) mAl = 0,4.27 = 10,8(g)
\(n_{H_2SO_4}=\dfrac{58.8}{98}=0.6\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(0.4........0.6..................................0.6\)
\(V_{H_2}=0.6\cdot22.4=13.44\left(l\right)\)
\(m_{Al}=0.4\cdot27=10.8\left(g\right)\)