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C3H8 + 5O2 ==> 3CO2 + 4H2O balanced equationmole ratio O2:C2H8 = 5:1
1.5 moles C3H8 x 5 moles O2/mole C3H8 = 7.5 moles O2 needed
We need 7,5 moles O2.
This equation is exothermic. The energy is written in positive numerals on the right hand side. This means that energy has been released. Moreover, this is a combustion reaction.