设物质的量为X y
Mg~H2↑ 2Al~3H2↑
1 1 2 3
x x y 3y/2
氢气0.5mol
x+3y/2=0.5
24x+27y=10.2
计算得x=0.2 y=0.2
Mg:0.2*24=4.8g
Al:0.2*27=5.4g
完毕!