At Constant Pressure,the Combustion of 20 $\mathrm { mol } ^ { - 1 }$

At constant pressure,the combustion of 20.0 g of C₂H₆(g) releases 1036 kJ of heat.What is ?H for the reaction given below?
2C₂H₆(g) + 7O₂(g) ? 4CO₂(g) + 6H₂O(l)

A) -173 kJ $\mathrm { mol } ^ { - 1 }$
B) -779 kJ $\mathrm { mol } ^ { - 1 }$
C) -1560 kJ $\mathrm { mol } ^ { - 1 }$
D) -3120 kJ $\mathrm { mol } ^ { - 1 }$