Propane, C3H8, is flammable and used in rural areas where natural gas is not available. What is the coefficient of oxygen in the balanced equation for the combustion of propane?
__C3H8(g) + __O2(g) __CO2(g) + __H2O(g)
C3H8 + 5O2 ---> 3CO2 + 4H2O
so its 5