Given the equation:

C2H6 (g) + O2 (g) → CO2 (g) + H2O (g) (not balanced)

Determine the number of liters of CO2 formed at STP when 891.6 grams of C2H6 is burned in excess oxygen gas.

Your answer should be numerical and neglect units (e.g., if you calculate 3.5L then input 3.5).