The burning of natural gas in a gas stove is an example of a combustion reaction. natural gas is mostly methane, ch4. the o2 gas comes from the air. which of these is the correct chemical reaction for this?

                              CH₄  +  2 O₂     →     CO₂  +  2 H₂O

Solution:

Balance chemical equation for said reaction is written in following steps.

1) Write down the reactants and products first,

                               CH₄  +  O₂     →     CO₂  +  H₂O

2) Analyze number of elements at left and right hand side,
So,
                     L.H.S                                    R.H.S
Carbon             1                                           1
Hydrogen         4                                           2
Oxygen             2                                           3

So, the carbon atoms are balanced. Hydrogen atoms are greater at L.H.S, so to balance hydrogen atoms multiply H₂O at R.H.S by 2, hence,

                               CH₄  +  O₂     →     CO₂  +  2 H₂O
Now,
                     L.H.S                                    R.H.S
Carbon             1                                           1
Hydrogen         4                                           4
Oxygen             2                                           4

So, the carbon atoms are balanced. Hydrogen atoms are balanced but oxygen atoms are greater at R.H.S, so to balance oxygen atoms multiply O₂ at L.H.S by 2, hence,

                               CH₄  +  2 O₂     →     CO₂  +  2 H₂O
Now,
                     L.H.S                                    R.H.S
Carbon             1                                           1
Hydrogen         4                                           4
Oxygen             4                                           4

Equation is balanced now.

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