6C+O2=CO2

H2+Cl=HCL
H+SO4=H2SO4
Cu+o2=CuO
K+H20=K0H+H2

You don't give any insructions so I don't know what you are trying to do.

equation 1 is ok but is isn't balanced.
C + O2 ==> CO2.

equation 2 is ok except Cl occurs in its free state as Cl2. Therefore,
H2 + Cl2 ==> 2HCl. also note that the l is not a capital L.

equation 3 I don't know about.

2Cu + O2 ==> 2CuO

The last equation is ok but it isn't balanced.
2K + 2H2O ==> 2KOH + H2