Question

when propane is reacted in the presence of oxygen gas, the products of this combustion reaction are:
co2 + h2o
ch2 + h2o
c + h2
co2 + h2

Explanation:

The complete combustion of a hydrocarbon like propane ($C_3H_8$) in the presence of oxygen produces carbon - dioxide ($CO_2$) and water ($H_2O$). The general equation for the complete combustion of a hydrocarbon $C_xH_y$ is $C_xH_y+(x + \frac{y}{4})O_2
ightarrow xCO_2+\frac{y}{2}H_2O$. For propane ($C_3H_8$), the reaction is $C_3H_8 + 5O_2
ightarrow3CO_2+4H_2O$.

Answer:

$CO_2 + H_2O$