How many moles of C₆H₁₂ (cyclohexane) must be reacted according to the following balanced chemical reaction to transfer -419.1 kJ of heat?

C₆H₁₂(l) + 9 O₂(g) → 6 CO₂(g) + 6 H₂O(g)
∆H = -3919.4 kJ
Need help on where to start! Keep getting the wrong answer