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The balanced chemical reaction is:

C3H8 + 5O2 = 3CO2 + 4H2O

We are given the amount of C3H8 to be used for the reaction. This will be the starting point for the calculations.

73.7 g C3H8 (1 mol C3H8 / 44.11 g C3H8) ( 5 mol O2 / 1 mol C3H8 )  ( 32 g O2 / 1 mol O2 ) = 267.3 g O2

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