# Problem: Using Hess' Law, calculate the enthalpy of formation for C 3H8(g) using the following thermodynamic data.C(s) + O2(g) → CO2(g) ΔH = -393.5 kj/molH2(g) + 1/2O2(g) → H2O(I) ΔH = -285.8 kj/molC3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(I) ΔH = 2199.0 kJ/mol

###### FREE Expert Solution
87% (347 ratings)
###### Problem Details

Using Hess' Law, calculate the enthalpy of formation for C 3H8(g) using the following thermodynamic data.

C(s) + O2(g) → CO2(g) ΔH = -393.5 kj/mol

H2(g) + 1/2O2(g) → H2O(I) ΔH = -285.8 kj/mol

C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(I) ΔH = 2199.0 kJ/mol

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems .

What is the difficulty of this problem?

Our tutors rated the difficulty of Using Hess' Law, calculate the enthalpy of formation for C 3... as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Sabrina took 7 minutes to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Collins' class at AUSTINCC.