# Problem: Given the following data2 O3 (g) → 3 O2 (g)            ΔH = -427 kJO2 (g) → 2O (g)                  ΔH = 495 kJNO (g) + O3 (g) → NO2 (g) + O2 (g)   ΔH = -199 kJCalculate ΔH for the reactionNO (g) + O (g) → NO2 (g)

###### FREE Expert Solution
86% (153 ratings)
###### FREE Expert Solution

We’re being asked to determine the enthalpy change (ΔHrxn) for the chemical reaction:

NO (g) + O (g) → NO2 (g)

We can use Hess’s Law to determine the enthalpy change of the overall reaction from the given reactions:

1. 2 O3 (g) → 3 O(g)                                                       ΔH1 = -427 kJ

2. O2 (g) → 2O (g)                                                            ΔH2 = 495 kJ

3. NO (g) + O3 (g) → NO2 (g) + O2 (g)                              ΔH3 = -199 kJ

We now need to find a combination of reactions that when added up, gives us the overall reaction.

86% (153 ratings)
###### Problem Details

Given the following data

2 O3 (g) → 3 O(g)            ΔH = -427 kJ

O2 (g) → 2O (g)                  ΔH = 495 kJ

NO (g) + O3 (g) → NO2 (g) + O2 (g)   ΔH = -199 kJ

Calculate ΔH for the reaction

NO (g) + O (g) → NO2 (g)

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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Our tutors rated the difficulty of Given the following data2 O3 (g) → 3 O2 (g)            ΔH = ... as medium difficulty.

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

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