Error:
C %2B K2Cr2O7 %2B H2SO4 %3D Cr2%28SO4%293 %2B K2SO4 %2B CO2 %2B H2O
^
Unexpected character ('%')C %2B K2Cr2O7 %2B H2SO4 %3D Cr2%28SO4%293 %2B K2SO4 %2B CO2 %2B H2O
^
Unexpected character ('%')