A,Mg= 24g/mol
n= 2,4g/24g/mol= 0,1mol
2mol................1mol.......................................1mol
2CH3COOH +Mg----------> (CH3COO)Mg + H2
x=0,2mol.,<.........0,1mol.......................>...y=.0,1mol
c= n/V
c= 0,2mol/ 0,2 l= 1M
V,H2= 0,1molx22,4l/mol= 2,24l