Error:
KMnO4 %2B SnCl2 %2B HCl %3D MnCl2 %2B SnCl4 %2B KCl %2B H2O
^
Unexpected character ('%')KMnO4 %2B SnCl2 %2B HCl %3D MnCl2 %2B SnCl4 %2B KCl %2B H2O
^
Unexpected character ('%')