Calculate the amount of heat produced when 6.247 L of liquid glycerol (C₃H₈O₃) is burned in excess oxygen gas according to the following thermochemical reaction:
2C₃H₈O₃(l)+7O₂(g)→6CO₂(g)+8H₂O(g). △H=−3311kJ
The density of glycerol at 25⁰C is 1.261 g/mL.