Error:
CuO %2B Cu %2B H2SO4 %3D Cu%28OH%292 %2B CuSO4 %2B H2O
^Unexpected character ('%')CuO %2B Cu %2B H2SO4 %3D Cu%28OH%292 %2B CuSO4 %2B H2O
^Unexpected character ('%')