Question

Write the Balanced Equation
Skeleton:
CH4 + O2 → H2O + CO2
I don't understand how to balance this

Answer 1

CH4 + O2 → H2O + CO2
This is an equatiion that can be balanced by inspection. That's just another way of saying we take a guess. But you don't guess just any numbers but make educated guesses. For example, I see 1 C on the left and 1 C on the right so let's leave that alone. Next I wee 4 H atoms on the left with CH4 so let's put a 2 in front of te H2O on the right which will give us 4 H atoms on the right like this.
CH4 + O2 → 2H2O + CO2
Next I notice there is just 1 O2 on the left but two places on the right for O. So it makes sense to me to count how many I need on the right. I see 2 O from 2H2O and I see 2 O from 1 CO2. That makes 4 O atoms we need on the left. Just place a two in front of the O2 like this.
CH4 +2O2 → 2H2O + CO2
Don't quit there.It is imperative that you check it to make sure there are the same number of atoms of each element on each side of the equation. If not you are not through.
CH4 +2O2 → 2H2O + CO2
1 C on left and right
4 H on left from CH4 and 4 on right from 2H2O
4 O on left from 2O2 and 4 on right from 2H2O and CO2.
Done.
There is another way to do this by using an oxidation/reduction method but this is the simple way.

Answer 2

Balanced equation:-
CH4+2O2---->Co2+2H2O