Question

What needs to be done to balance this

equation?
CHA
O2
CO2
+ 2 H20
Remove coefficient 2 in front of
H2O on the right side of the
equation
Do nothing (equation is balanced).
Add coefficient 2 to O2 on the left
side of the equation.
Change O2 to Os on the left side
of the equation

Answer 1

I'm not sure, but "Add coefficient 2 to O2...". You didn't really write out the equation properly.