m Al = ?
p = 75%
V = 3,36L H2
C = 1M
n = V/Vm = 3,36/22,4 = 0,15 moli H2
2Al + 3H2SO4 => Al2(SO4)3 + 3H2
2*27g Al.......................3 moli H2
xg Al............................0,15 moli H2
x = 54*0,15/3 = 2,7g Al ( m pur)
p = m pur/m impur*100 => m impur = 270/75 = 3,6g Al
n H2SO4 = n H2 = 0,15 moli
C = n/Vs => Vs = n/C = 0,15/1 = 0,15 L = 150mL sol. H2SO4