a)m Al2(SO4)3=6,84.\(\dfrac{200}{100}\)=13,68g
=>n Al2(SO4)3=0,04 mol
b)n HCl=3.0,2=0,6 mol
a. \(m_{Al_2\left(SO_4\right)_3}=200.6,84\%=13,68\left(g\right)\)
\(n_{Al_2\left(SO_4\right)_3}=\dfrac{13.68}{342}=0,04\left(mol\right)\)
b. \(n_{HNO_3}=0,2.3=0,6\left(mol\right)\)