Question

Find the ∆Hrxn for the reaction:
3C(s)+4H₂(g) →C₃H₈(g)
Using these reactions with known ∆H's:
C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g) ∆H = −2043 kJ
C(s) + O₂(g) → CO₂(g) ∆H = −393.5 kJ
2H₂(g) + O2(g) → 2H₂O(g) ∆H = −483.6 kJ
Express your answer in kJ.