\(n_{Al}=\dfrac{2.7}{27}=0.1\left(mol\right)\)
\(n_{CuSO_4}=0.6\cdot0.1=0.06\left(mol\right)\)
\(2Al+3CuSO_4\rightarrow Al_2\left(SO_4\right)_3+3Cu\)
\(2............3\)
\(0.1.........0.06\)
\(LTL:\dfrac{0.1}{2}>\dfrac{0.06}{3}\Rightarrow Aldư\)
\(m_{Al\left(dư\right)}=\left(0.1-0.04\right)\cdot27=1.62\left(g\right)\)
\(C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{0.02}{0.1}=0.2\left(M\right)\)
a) $2Al + 3CuSO_4 \to Al_2(SO_4)_3 + 3Cu$
b) n CuSO4 = 0,1.0,6 = 0,06(mol)
Theo PTHH :
n Al pư = 2/3 n CuSO4 = 0,04(mol)
m Al dư = 2,7 - 0,04.27 = 1,62(gam)
c)
n Al2(SO4)3 = 1/2 n Al = 0,02(mol)
CM Al2(SO4)3 = 0,02/0,1 = 0,2M