By using the following reactions, calculate the heat of formation of pentane (C5H12) gas from carbon and hydrogen gas. C (s) + O2 (g) CO2 (g), H = 395 kJ/mol
H2 (g) + 1/2O2 (g) H2O (l), H = 285 kJ/mol
C5H12 (g) + 8O2 5CO2 (g) + 6H2O (l), H = 3.54 × 103 kJ/mol

Question

By using the following reactions, calculate the heat of formation of pentane (C5H12) gas from carbon and hydrogen gas. C (s) + O2 (g)  CO2 (g), H = 395 kJ/mol
H2 (g) + 1/2O2 (g)  H2O (l), H = 285 kJ/mol
C5H12 (g) + 8O2  5CO2 (g) + 6H2O (l), H = 3.54 × 103  kJ/mol

anonymous · Answer

My teacher told me yesterday in tutoring that I need to reverse some of them and multiply others and I'm just really lost with this.

amurciano2 · Answer

I know how to do this
Give me 5min.

amurciano2 · Answer

Can you post a pic of the question? There we no arrows.

anonymous · Answer

My bad, are you still available?

anonymous · Answer

C (s) + O2 (g) -> CO2 (g), H = 395 kJ/mol

anonymous · Answer

H2 (g) + 1/2O2 (g) -> H2O (l), H = 285 kJ/mol

anonymous · Answer

C5H12 (g) + 8O2 ->  5CO2 (g) + 6H2O (l), H = 3.54 × 103  kJ/mol

amurciano2 · Answer

Yup I can still help.

anonymous · Answer

I added the arrows

anonymous · Answer

does that work?

amurciano2 · Answer

I think you are missing a reaction,but I'm not positive

amurciano2 · Answer

What is the equation you are trying to get, I assume it is this one

anonymous · Answer

I am simply trying to find the heat of formation of those three equations