nMg= 6,5/24=0,27(mol)
2Mg + O2 ---to---> 2MgO
Theo PTHH: nO2=1/2.nMg=1/2.0,27=0,135(mol)
=>V O2=0,135.22,4=3,024(l)
2KMnO4 ---to---> K2MnO4 + MnO2 + O2
Theo PTHH: nKMnO4=2.nO2=2.0,135=0,27(mol)
=>m KMnO4=0,27.158=42,66(g)
=>m thuoc tim=(42,66:80).100=53,325(g)
-----------------Fver Thanks!----------------------