# Problem: Given the following data: 3CO2(g) + 4H2O(l) ⇌ C3H8(g) + 5O2(g) ∆H = 1, 110 kJ · mol−1 H2O(l) ⇌ H2(g) + 1/2O2(g) ∆H = 142.5 kJ · mol−1 3Cgraphite + 4H2(g) ⇌ C3H8(g) ∆H = −52 kJ · mol−1 calculate ∆H for the reaction Cgraphite + O2(g) ⇌ CO2(g) 1. 1202 kJ · mol−1 2. −592 kJ · mol−1 3. 543 kJ · mol−1 4. −197 kJ · mol−1 5. −543 kJ · mol−1

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###### Problem Details

Given the following data:

3CO2(g) + 4H2O(l) ⇌ C3H8(g) + 5O2(g)

∆H = 1, 110 kJ · mol−1

H2O(l) ⇌ H2(g) + 1/2O2(g)

∆H = 142.5 kJ · mol−1

3Cgraphite + 4H2(g) ⇌ C3H8(g)

∆H = −52 kJ · mol−1

calculate ∆H for the reaction

Cgraphite + O2(g) ⇌ CO2(g)

1. 1202 kJ · mol−1

2. −592 kJ · mol−1

3. 543 kJ · mol−1

4. −197 kJ · mol−1

5. −543 kJ · mol−1

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.

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Based on our data, we think this problem is relevant for Professor Costanza's class at USF.