(1):2Al+2NaOH+2H2O＝2NaAlO2+3H2↑
(2):2Al+3H2SO4＝Al2(SO4)3+3H2↑
因为它们Al:H2都为2:3,即2molAl生成3molH2,所以H2(1):H2(2)为1:1.