A theory is a well-established, data-backed idea that has been shown true many times but cannot be 100% proven
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now split the equation in half
CH4+O2 I CO2 + 4H2O
C = 1 I C = 1
H = 4 I H = 8
O = 2 I O = 3
CH4+ 2O2 = CO2 + 2H20
