Error:
HNO3 %2B CuS2 %3D H2O %2B H2SO4 %2B NO %2B Cu%28NO3%292
^Unexpected character ('%')HNO3 %2B CuS2 %3D H2O %2B H2SO4 %2B NO %2B Cu%28NO3%292
^Unexpected character ('%')