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Help me with this chemical exercise plz

Assume that one liter of ethane (C2H6) measured at 25 ° C and 745 torr is placed in a strong 5.0 L container along with 6.0 g of oxygen gas.  The combustion reaction (explosion in this case) is started by a spark.  Then the container is cooled to 150 ° C.  What is the total pressure in mmHg inside the container?  The equation is: 


2C2H6g) + 702g) → 4CO2g) + 6H2O @).  R / 1.72 atm

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