Error:
H%3A%2B %2B I%3A- %2B BrO%3A- %3D H2O %2B I2 %2B Br%3A-
^
Unexpected character ('%')H%3A%2B %2B I%3A- %2B BrO%3A- %3D H2O %2B I2 %2B Br%3A-
^
Unexpected character ('%')