a) \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
\(n_{NaOH}=0,1.0,1=0,01\left(mol\right)\)
PTHH: 2Al + 2NaOH + 2H2O --> 2NaAlO2 + 3H2
0,01<--0,01------------------------->0,015
Xét tỉ lệ: \(\dfrac{0,1}{2}>\dfrac{0,01}{2}\) =< NaOH hết, Al dư
=> \(V_{H_2}=0,015.22,4=0,336\left(l\right)\)
c) mNaOH = 0,01.40 = 0,4 (g)