Gọi số mol KMnO4;KClO3;K2Cr2O7KMnO4;KClO3;K2Cr2O7 lần lượt là x, y, z.

→158x+122,5y+294z=57,45(1)→158x+122,5y+294z=57,45(1)

2KMnO4+16HCl→2KCl+2MnCl2+5Cl2+8H2O2KMnO4+16HCl→2KCl+2MnCl2+5Cl2+8H2OKClO3+6HCl→KCl+3Cl2+3H2OKClO3+6HCl→KCl+3Cl2+3H2OK2Cr2O7+14HCl→2KCl+2CrCl3+3Cl2+7H2OK2Cr2O7+14HCl→2KCl+2CrCl3+3Cl2+7H2O

nKCl=29,874,5=0,4(mol)nKCl=29,874,5=0,4(mol)

→x+y+2z=0,4(2)→x+y+2z=0,4(2)

{nMnCl2=x(mol)nCrCl3=2z(mol){nMnCl2=x(mol)nCrCl3=2z(mol)

→x2z=12→x−z=0(3)→x2z=12→x−z=0(3)

Từ (1);(2);(3)→⎧⎪⎨⎪⎩x=0,1(mol)y=0,1(mol)z=0,1(mol)(1);(2);(3)→{x=0,1(mol)y=0,1(mol)z=0,1(mol)

→nCl2=2,5x+3y+3z=2,5.0,1+3.0,1+3.0,1=0,85(mol)→nCl2=2,5x+3y+3z=2,5.0,1+3.0,1+3.0,1=0,85(mol)

→V=0,85×22,4=19,04(l)→V=0,85×22,4=19,04(l)
→A