2Na + 2H2O = 2NaOH + H2↑
2Al + 2NaOH + 2H2O = 2NaAlO2 + 3H2↑
8.96L=0.25mol
列比例解得:NA=4.6g,Al=5.3g
c=0.2mol/0.2L=1mol/L