很简单的,1mol镁对应1mol氢分子,一mol铝对应1.5ml氢分子,都是m克,则镁有m/24 mol,对应m/24mol氢分子,铝有m/27,对应1.5m/27氢分子,m/24:1.5m/27=3:4
设Mg和Al都是216g Mg+2HCl=MgCl2+H2 24g 1 216g x=1*216/24=216/24=9 2Al+6HCl=2AlCl3+3H2 54g 3 216g x=3*216/54=648/54=12 9:12=3:4